ISC DHCP  4.3.4
A reference DHCPv4 and DHCPv6 implementation
ldap.c
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1 /* ldap.c
2 
3  Routines for reading the configuration from LDAP */
4 
5 /*
6  * Copyright (c) 2010,2015 by Internet Systems Consortium, Inc. ("ISC")
7  * Copyright (c) 2003-2006 Ntelos, Inc.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  *
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in the
18  * documentation and/or other materials provided with the distribution.
19  * 3. Neither the name of The Internet Software Consortium nor the names
20  * of its contributors may be used to endorse or promote products derived
21  * from this software without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
24  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27  * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
31  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
32  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
34  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  *
37  * This LDAP module was written by Brian Masney <masneyb@ntelos.net>. Its
38  * development was sponsored by Ntelos, Inc. (www.ntelos.com).
39  */
40 
41 #include "dhcpd.h"
42 #if defined(LDAP_CONFIGURATION)
43 #include <signal.h>
44 #include <errno.h>
45 #include <ctype.h>
46 #include <netdb.h>
47 #include <net/if.h>
48 #if defined(HAVE_IFADDRS_H)
49 #include <ifaddrs.h>
50 #endif
51 #include <string.h>
52 
53 #if defined(LDAP_CASA_AUTH)
54 #include "ldap_casa.h"
55 #endif
56 
57 #if defined(LDAP_USE_GSSAPI)
58 #include <sasl/sasl.h>
59 #include "ldap_krb_helper.h"
60 #endif
61 
62 static LDAP * ld = NULL;
63 static char *ldap_server = NULL,
64  *ldap_username = NULL,
65  *ldap_password = NULL,
66  *ldap_base_dn = NULL,
67  *ldap_dhcp_server_cn = NULL,
68  *ldap_debug_file = NULL;
69 static int ldap_port = LDAP_PORT,
70  ldap_method = LDAP_METHOD_DYNAMIC,
71  ldap_referrals = -1,
72  ldap_debug_fd = -1,
73  ldap_enable_retry = -1,
74  ldap_init_retry = -1;
75 #if defined (LDAP_USE_SSL)
76 static int ldap_use_ssl = -1, /* try TLS if possible */
77  ldap_tls_reqcert = -1,
78  ldap_tls_crlcheck = -1;
79 static char *ldap_tls_ca_file = NULL,
80  *ldap_tls_ca_dir = NULL,
81  *ldap_tls_cert = NULL,
82  *ldap_tls_key = NULL,
83  *ldap_tls_ciphers = NULL,
84  *ldap_tls_randfile = NULL;
85 #endif
86 
87 #if defined (LDAP_USE_GSSAPI)
88 static char *ldap_gssapi_keytab = NULL,
89  *ldap_gssapi_principal = NULL;
90 
91 struct ldap_sasl_instance {
92  char *sasl_mech;
93  char *sasl_realm;
94  char *sasl_authz_id;
95  char *sasl_authc_id;
96  char *sasl_password;
97 };
98 
99 static struct ldap_sasl_instance *ldap_sasl_inst = NULL;
100 
101 static int
102 _ldap_sasl_interact(LDAP *ld, unsigned flags, void *defaults, void *sin) ;
103 #endif
104 
105 static struct ldap_config_stack *ldap_stack = NULL;
106 
107 typedef struct ldap_dn_node {
108  struct ldap_dn_node *next;
109  size_t refs;
110  char *dn;
111 } ldap_dn_node;
112 
113 static ldap_dn_node *ldap_service_dn_head = NULL;
114 static ldap_dn_node *ldap_service_dn_tail = NULL;
115 
116 static int ldap_read_function (struct parse *cfile);
117 
118 static struct parse *
119 x_parser_init(const char *name)
120 {
121  struct parse *cfile;
122  isc_result_t res;
123  char *inbuf;
124 
125  inbuf = dmalloc (LDAP_BUFFER_SIZE, MDL);
126  if (inbuf == NULL)
127  return NULL;
128 
129  cfile = (struct parse *) NULL;
130  res = new_parse (&cfile, -1, inbuf, LDAP_BUFFER_SIZE, name, 0);
131  if (res != ISC_R_SUCCESS)
132  {
133  dfree(inbuf, MDL);
134  return NULL;
135  }
136  /* the buffer is still empty */
137  cfile->bufsiz = LDAP_BUFFER_SIZE;
138  cfile->buflen = cfile->bufix = 0;
139  /* attach ldap read function */
140  cfile->read_function = ldap_read_function;
141  return cfile;
142 }
143 
144 static isc_result_t
145 x_parser_free(struct parse **cfile)
146 {
147  if (cfile && *cfile)
148  {
149  if ((*cfile)->inbuf)
150  dfree((*cfile)->inbuf, MDL);
151  (*cfile)->inbuf = NULL;
152  (*cfile)->bufsiz = 0;
153  return end_parse(cfile);
154  }
155  return ISC_R_SUCCESS;
156 }
157 
158 static int
159 x_parser_resize(struct parse *cfile, size_t len)
160 {
161  size_t size;
162  char * temp;
163 
164  /* grow by len rounded up at LDAP_BUFFER_SIZE */
165  size = cfile->bufsiz + (len | (LDAP_BUFFER_SIZE-1)) + 1;
166 
167  /* realloc would be better, but there isn't any */
168  if ((temp = dmalloc (size, MDL)) != NULL)
169  {
170 #if defined (DEBUG_LDAP)
171  log_info ("Reallocated %s buffer from %zu to %zu",
172  cfile->tlname, cfile->bufsiz, size);
173 #endif
174  memcpy(temp, cfile->inbuf, cfile->bufsiz);
175  dfree(cfile->inbuf, MDL);
176  cfile->inbuf = temp;
177  cfile->bufsiz = size;
178  return 1;
179  }
180 
181  /*
182  * Hmm... what is worser, consider it as fatal error and
183  * bail out completely or discard config data in hope it
184  * is "only" an option in dynamic host lookup?
185  */
186  log_error("Unable to reallocated %s buffer from %zu to %zu",
187  cfile->tlname, cfile->bufsiz, size);
188  return 0;
189 }
190 
191 static char *
192 x_parser_strcat(struct parse *cfile, const char *str)
193 {
194  size_t cur = strlen(cfile->inbuf);
195  size_t len = strlen(str);
196  size_t cnt;
197 
198  if (cur + len >= cfile->bufsiz && !x_parser_resize(cfile, len))
199  return NULL;
200 
201  cnt = cfile->bufsiz > cur ? cfile->bufsiz - cur - 1 : 0;
202  return strncat(cfile->inbuf, str, cnt);
203 }
204 
205 static inline void
206 x_parser_reset(struct parse *cfile)
207 {
208  cfile->inbuf[0] = '\0';
209  cfile->bufix = cfile->buflen = 0;
210 }
211 
212 static inline size_t
213 x_parser_length(struct parse *cfile)
214 {
215  cfile->buflen = strlen(cfile->inbuf);
216  return cfile->buflen;
217 }
218 
219 static char *
220 x_strxform(char *dst, const char *src, size_t dst_size,
221  int (*xform)(int))
222 {
223  if(dst && src && dst_size)
224  {
225  size_t len, pos;
226 
227  len = strlen(src);
228  for(pos=0; pos < len && pos + 1 < dst_size; pos++)
229  dst[pos] = xform((int)src[pos]);
230  dst[pos] = '\0';
231 
232  return dst;
233  }
234  return NULL;
235 }
236 
237 static int
238 get_host_entry(char *fqdnname, size_t fqdnname_size,
239  char *hostaddr, size_t hostaddr_size)
240 {
241 #if defined(MAXHOSTNAMELEN)
242  char hname[MAXHOSTNAMELEN+1];
243 #else
244  char hname[65];
245 #endif
246  struct hostent *hp;
247 
248  if (NULL == fqdnname || 1 >= fqdnname_size)
249  return -1;
250 
251  memset(hname, 0, sizeof(hname));
252  if (gethostname(hname, sizeof(hname)-1))
253  return -1;
254 
255  if (NULL == (hp = gethostbyname(hname)))
256  return -1;
257 
258  strncpy(fqdnname, hp->h_name, fqdnname_size-1);
259  fqdnname[fqdnname_size-1] = '\0';
260 
261  if (hostaddr != NULL)
262  {
263  if (hp->h_addr != NULL)
264  {
265  struct in_addr *aptr = (struct in_addr *)hp->h_addr;
266 #if defined(HAVE_INET_NTOP)
267  if (hostaddr_size >= INET_ADDRSTRLEN &&
268  inet_ntop(AF_INET, aptr, hostaddr, hostaddr_size) != NULL)
269  {
270  return 0;
271  }
272 #else
273  char *astr = inet_ntoa(*aptr);
274  size_t alen = strlen(astr);
275  if (astr && alen > 0 && hostaddr_size > alen)
276  {
277  strncpy(hostaddr, astr, hostaddr_size-1);
278  hostaddr[hostaddr_size-1] = '\0';
279  return 0;
280  }
281 #endif
282  }
283  return -1;
284  }
285  return 0;
286 }
287 
288 #if defined(HAVE_IFADDRS_H)
289 static int
290 is_iface_address(struct ifaddrs *addrs, struct in_addr *addr)
291 {
292  struct ifaddrs *ia;
293  struct sockaddr_in *sa;
294  int num = 0;
295 
296  if(addrs == NULL || addr == NULL)
297  return -1;
298 
299  for (ia = addrs; ia != NULL; ia = ia->ifa_next)
300  {
301  ++num;
302  if (ia->ifa_addr && (ia->ifa_flags & IFF_UP) &&
303  ia->ifa_addr->sa_family == AF_INET)
304  {
305  sa = (struct sockaddr_in *)(ia->ifa_addr);
306  if (addr->s_addr == sa->sin_addr.s_addr)
307  return num;
308  }
309  }
310  return 0;
311 }
312 
313 static int
314 get_host_address(const char *hostname, char *hostaddr, size_t hostaddr_size, struct ifaddrs *addrs)
315 {
316  if (hostname && *hostname && hostaddr && hostaddr_size)
317  {
318  struct in_addr addr;
319 
320 #if defined(HAVE_INET_PTON)
321  if (inet_pton(AF_INET, hostname, &addr) == 1)
322 #else
323  if (inet_aton(hostname, &addr) != 0)
324 #endif
325  {
326  /* it is already IP address string */
327  if(strlen(hostname) < hostaddr_size)
328  {
329  strncpy(hostaddr, hostname, hostaddr_size-1);
330  hostaddr[hostaddr_size-1] = '\0';
331 
332  if (addrs != NULL && is_iface_address (addrs, &addr) > 0)
333  return 1;
334  else
335  return 0;
336  }
337  }
338  else
339  {
340  struct hostent *hp;
341  if ((hp = gethostbyname(hostname)) != NULL && hp->h_addr != NULL)
342  {
343  struct in_addr *aptr = (struct in_addr *)hp->h_addr;
344  int mret = 0;
345 
346  if (addrs != NULL)
347  {
348  char **h;
349  for (h=hp->h_addr_list; *h; h++)
350  {
351  struct in_addr *haddr = (struct in_addr *)*h;
352  if (is_iface_address (addrs, haddr) > 0)
353  {
354  aptr = haddr;
355  mret = 1;
356  }
357  }
358  }
359 
360 #if defined(HAVE_INET_NTOP)
361  if (hostaddr_size >= INET_ADDRSTRLEN &&
362  inet_ntop(AF_INET, aptr, hostaddr, hostaddr_size) != NULL)
363  {
364  return mret;
365  }
366 #else
367  char *astr = inet_ntoa(*aptr);
368  size_t alen = strlen(astr);
369  if (astr && alen > 0 && alen < hostaddr_size)
370  {
371  strncpy(hostaddr, astr, hostaddr_size-1);
372  hostaddr[hostaddr_size-1] = '\0';
373  return mret;
374  }
375 #endif
376  }
377  }
378  }
379  return -1;
380 }
381 #endif /* HAVE_IFADDRS_H */
382 
383 static void
384 ldap_parse_class (struct ldap_config_stack *item, struct parse *cfile)
385 {
386  struct berval **tempbv;
387 
388  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
389  tempbv[0] == NULL)
390  {
391  if (tempbv != NULL)
392  ldap_value_free_len (tempbv);
393 
394  return;
395  }
396 
397  x_parser_strcat (cfile, "class \"");
398  x_parser_strcat (cfile, tempbv[0]->bv_val);
399  x_parser_strcat (cfile, "\" {\n");
400 
401  item->close_brace = 1;
402  ldap_value_free_len (tempbv);
403 }
404 
405 static int
406 is_hex_string(const char *str)
407 {
408  int colon = 1;
409  int xdigit = 0;
410  size_t i;
411 
412  if (!str)
413  return 0;
414 
415  if (*str == '-')
416  str++;
417 
418  for (i=0; str[i]; ++i)
419  {
420  if (str[i] == ':')
421  {
422  xdigit = 0;
423  if(++colon > 1)
424  return 0;
425  }
426  else if(isxdigit((unsigned char)str[i]))
427  {
428  colon = 0;
429  if (++xdigit > 2)
430  return 0;
431  }
432  else
433  return 0;
434  }
435  return i > 0 && !colon;
436 }
437 
438 static void
439 ldap_parse_subclass (struct ldap_config_stack *item, struct parse *cfile)
440 {
441  struct berval **tempbv, **classdata;
442  char *tmp;
443 
444  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
445  tempbv[0] == NULL)
446  {
447  if (tempbv != NULL)
448  ldap_value_free_len (tempbv);
449 
450  return;
451  }
452 
453  if ((classdata = ldap_get_values_len (ld, item->ldent,
454  "dhcpClassData")) == NULL ||
455  classdata[0] == NULL)
456  {
457  if (classdata != NULL)
458  ldap_value_free_len (classdata);
459  ldap_value_free_len (tempbv);
460 
461  return;
462  }
463 
464  x_parser_strcat (cfile, "subclass \"");
465  x_parser_strcat (cfile, classdata[0]->bv_val);
466  if (is_hex_string(tempbv[0]->bv_val))
467  {
468  x_parser_strcat (cfile, "\" ");
469  x_parser_strcat (cfile, tempbv[0]->bv_val);
470  x_parser_strcat (cfile, " {\n");
471  }
472  else
473  {
474  tmp = quotify_string(tempbv[0]->bv_val, MDL);
475  x_parser_strcat (cfile, "\" \"");
476  x_parser_strcat (cfile, tmp);
477  x_parser_strcat (cfile, "\" {\n");
478  dfree(tmp, MDL);
479  }
480 
481  item->close_brace = 1;
482  ldap_value_free_len (tempbv);
483  ldap_value_free_len (classdata);
484 }
485 
486 
487 static void
488 ldap_parse_host (struct ldap_config_stack *item, struct parse *cfile)
489 {
490  struct berval **tempbv, **hwaddr;
491 
492  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
493  tempbv[0] == NULL)
494  {
495  if (tempbv != NULL)
496  ldap_value_free_len (tempbv);
497 
498  return;
499  }
500 
501  hwaddr = ldap_get_values_len (ld, item->ldent, "dhcpHWAddress");
502 
503  x_parser_strcat (cfile, "host ");
504  x_parser_strcat (cfile, tempbv[0]->bv_val);
505  x_parser_strcat (cfile, " {\n");
506 
507  if (hwaddr != NULL)
508  {
509  if (hwaddr[0] != NULL)
510  {
511  x_parser_strcat (cfile, "hardware ");
512  x_parser_strcat (cfile, hwaddr[0]->bv_val);
513  x_parser_strcat (cfile, ";\n");
514  }
515  ldap_value_free_len (hwaddr);
516  }
517 
518  item->close_brace = 1;
519  ldap_value_free_len (tempbv);
520 }
521 
522 
523 static void
524 ldap_parse_shared_network (struct ldap_config_stack *item, struct parse *cfile)
525 {
526  struct berval **tempbv;
527 
528  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
529  tempbv[0] == NULL)
530  {
531  if (tempbv != NULL)
532  ldap_value_free_len (tempbv);
533 
534  return;
535  }
536 
537  x_parser_strcat (cfile, "shared-network \"");
538  x_parser_strcat (cfile, tempbv[0]->bv_val);
539  x_parser_strcat (cfile, "\" {\n");
540 
541  item->close_brace = 1;
542  ldap_value_free_len (tempbv);
543 }
544 
545 
546 static void
547 parse_netmask (int netmask, char *netmaskbuf)
548 {
549  unsigned long nm;
550  int i;
551 
552  nm = 0;
553  for (i=1; i <= netmask; i++)
554  {
555  nm |= 1 << (32 - i);
556  }
557 
558  sprintf (netmaskbuf, "%d.%d.%d.%d", (int) (nm >> 24) & 0xff,
559  (int) (nm >> 16) & 0xff,
560  (int) (nm >> 8) & 0xff,
561  (int) nm & 0xff);
562 }
563 
564 
565 static void
566 ldap_parse_subnet (struct ldap_config_stack *item, struct parse *cfile)
567 {
568  struct berval **tempbv, **netmaskstr;
569  char netmaskbuf[sizeof("255.255.255.255")];
570  int i;
571 
572  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
573  tempbv[0] == NULL)
574  {
575  if (tempbv != NULL)
576  ldap_value_free_len (tempbv);
577 
578  return;
579  }
580 
581  if ((netmaskstr = ldap_get_values_len (ld, item->ldent,
582  "dhcpNetmask")) == NULL ||
583  netmaskstr[0] == NULL)
584  {
585  if (netmaskstr != NULL)
586  ldap_value_free_len (netmaskstr);
587  ldap_value_free_len (tempbv);
588 
589  return;
590  }
591 
592  x_parser_strcat (cfile, "subnet ");
593  x_parser_strcat (cfile, tempbv[0]->bv_val);
594 
595  x_parser_strcat (cfile, " netmask ");
596  parse_netmask (strtol (netmaskstr[0]->bv_val, NULL, 10), netmaskbuf);
597  x_parser_strcat (cfile, netmaskbuf);
598 
599  x_parser_strcat (cfile, " {\n");
600 
601  ldap_value_free_len (tempbv);
602  ldap_value_free_len (netmaskstr);
603 
604  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange")) != NULL)
605  {
606  for (i=0; tempbv[i] != NULL; i++)
607  {
608  x_parser_strcat (cfile, "range");
609  x_parser_strcat (cfile, " ");
610  x_parser_strcat (cfile, tempbv[i]->bv_val);
611  x_parser_strcat (cfile, ";\n");
612  }
613  ldap_value_free_len (tempbv);
614  }
615 
616  item->close_brace = 1;
617 }
618 
619 static void
620 ldap_parse_subnet6 (struct ldap_config_stack *item, struct parse *cfile)
621 {
622  struct berval **tempbv;
623  int i;
624 
625  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
626  tempbv[0] == NULL)
627  {
628  if (tempbv != NULL)
629  ldap_value_free_len (tempbv);
630 
631  return;
632  }
633 
634  x_parser_strcat (cfile, "subnet6 ");
635  x_parser_strcat (cfile, tempbv[0]->bv_val);
636 
637  x_parser_strcat (cfile, " {\n");
638 
639  ldap_value_free_len (tempbv);
640 
641  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange")) != NULL)
642  {
643  for (i=0; tempbv[i] != NULL; i++)
644  {
645  x_parser_strcat (cfile, "range6");
646  x_parser_strcat (cfile, " ");
647  x_parser_strcat (cfile, tempbv[i]->bv_val);
648  x_parser_strcat (cfile, ";\n");
649  }
650  ldap_value_free_len (tempbv);
651  }
652 
653  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpPermitList")) != NULL)
654  {
655  for (i=0; tempbv[i] != NULL; i++)
656  {
657  x_parser_strcat (cfile, tempbv[i]->bv_val);
658  x_parser_strcat (cfile, ";\n");
659  }
660  ldap_value_free_len (tempbv);
661  }
662 
663  item->close_brace = 1;
664 }
665 
666 static void
667 ldap_parse_pool (struct ldap_config_stack *item, struct parse *cfile)
668 {
669  struct berval **tempbv;
670  int i;
671 
672  x_parser_strcat (cfile, "pool {\n");
673 
674  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange")) != NULL)
675  {
676  x_parser_strcat (cfile, "range");
677  for (i=0; tempbv[i] != NULL; i++)
678  {
679  x_parser_strcat (cfile, " ");
680  x_parser_strcat (cfile, tempbv[i]->bv_val);
681  }
682  x_parser_strcat (cfile, ";\n");
683  ldap_value_free_len (tempbv);
684  }
685 
686  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpPermitList")) != NULL)
687  {
688  for (i=0; tempbv[i] != NULL; i++)
689  {
690  x_parser_strcat (cfile, tempbv[i]->bv_val);
691  x_parser_strcat (cfile, ";\n");
692  }
693  ldap_value_free_len (tempbv);
694  }
695 
696  item->close_brace = 1;
697 }
698 
699 static void
700 ldap_parse_pool6 (struct ldap_config_stack *item, struct parse *cfile)
701 {
702  struct berval **tempbv;
703  int i;
704 
705  x_parser_strcat (cfile, "pool {\n");
706 
707  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange")) != NULL)
708  {
709  x_parser_strcat (cfile, "range6");
710  for (i=0; tempbv[i] != NULL; i++)
711  {
712  x_parser_strcat (cfile, " ");
713  x_parser_strcat (cfile, tempbv[i]->bv_val);
714  }
715  x_parser_strcat (cfile, ";\n");
716  ldap_value_free_len (tempbv);
717  }
718 
719  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpPermitList")) != NULL)
720  {
721  for (i=0; tempbv[i] != NULL; i++)
722  {
723  x_parser_strcat(cfile, tempbv[i]->bv_val);
724  x_parser_strcat (cfile, ";\n");
725  }
726  ldap_value_free_len (tempbv);
727  }
728 
729  item->close_brace = 1;
730 }
731 
732 static void
733 ldap_parse_group (struct ldap_config_stack *item, struct parse *cfile)
734 {
735  x_parser_strcat (cfile, "group {\n");
736  item->close_brace = 1;
737 }
738 
739 
740 static void
741 ldap_parse_key (struct ldap_config_stack *item, struct parse *cfile)
742 {
743  struct berval **tempbv;
744 
745  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) != NULL)
746  {
747  x_parser_strcat (cfile, "key ");
748  x_parser_strcat (cfile, tempbv[0]->bv_val);
749  x_parser_strcat (cfile, " {\n");
750  ldap_value_free_len (tempbv);
751  }
752 
753  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpKeyAlgorithm")) != NULL)
754  {
755  x_parser_strcat (cfile, "algorithm ");
756  x_parser_strcat (cfile, tempbv[0]->bv_val);
757  x_parser_strcat (cfile, ";\n");
758  ldap_value_free_len (tempbv);
759  }
760 
761  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpKeySecret")) != NULL)
762  {
763  x_parser_strcat (cfile, "secret ");
764  x_parser_strcat (cfile, tempbv[0]->bv_val);
765  x_parser_strcat (cfile, ";\n");
766  ldap_value_free_len (tempbv);
767  }
768 
769  item->close_brace = 1;
770 }
771 
772 
773 static void
774 ldap_parse_zone (struct ldap_config_stack *item, struct parse *cfile)
775 {
776  char *cnFindStart, *cnFindEnd;
777  struct berval **tempbv;
778  char *keyCn;
779  size_t len;
780 
781  if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) != NULL)
782  {
783  x_parser_strcat (cfile, "zone ");
784  x_parser_strcat (cfile, tempbv[0]->bv_val);
785  x_parser_strcat (cfile, " {\n");
786  ldap_value_free_len (tempbv);
787  }
788 
789  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpDnsZoneServer")) != NULL)
790  {
791  x_parser_strcat (cfile, "primary ");
792  x_parser_strcat (cfile, tempbv[0]->bv_val);
793 
794  x_parser_strcat (cfile, ";\n");
795  ldap_value_free_len (tempbv);
796  }
797 
798  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpKeyDN")) != NULL)
799  {
800  cnFindStart = strchr(tempbv[0]->bv_val,'=');
801  if (cnFindStart != NULL)
802  cnFindEnd = strchr(++cnFindStart,',');
803  else
804  cnFindEnd = NULL;
805 
806  if (cnFindEnd != NULL && cnFindEnd > cnFindStart)
807  {
808  len = cnFindEnd - cnFindStart;
809  keyCn = dmalloc (len + 1, MDL);
810  }
811  else
812  {
813  len = 0;
814  keyCn = NULL;
815  }
816 
817  if (keyCn != NULL)
818  {
819  strncpy (keyCn, cnFindStart, len);
820  keyCn[len] = '\0';
821 
822  x_parser_strcat (cfile, "key ");
823  x_parser_strcat (cfile, keyCn);
824  x_parser_strcat (cfile, ";\n");
825 
826  dfree (keyCn, MDL);
827  }
828 
829  ldap_value_free_len (tempbv);
830  }
831 
832  item->close_brace = 1;
833 }
834 
835 #if defined(HAVE_IFADDRS_H)
836 static void
837 ldap_parse_failover (struct ldap_config_stack *item, struct parse *cfile)
838 {
839  struct berval **tempbv, **peername;
840  struct ifaddrs *addrs = NULL;
841  char srvaddr[2][64] = {"\0", "\0"};
842  int primary, split = 0, match;
843 
844  if ((peername = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
845  peername[0] == NULL)
846  {
847  if (peername != NULL)
848  ldap_value_free_len (peername);
849 
850  // ldap with disabled schema checks? fail to avoid syntax error.
851  log_error("Unable to find mandatory failover peering name attribute");
852  return;
853  }
854 
855  /* Get all interface addresses */
856  getifaddrs(&addrs);
857 
858  /*
859  ** when dhcpFailOverPrimaryServer or dhcpFailOverSecondaryServer
860  ** matches one of our IP address, the following valiables are set:
861  ** - primary is 1 when we are primary or 0 when we are secondary
862  ** - srvaddr[0] contains ip address of the primary
863  ** - srvaddr[1] contains ip address of the secondary
864  */
865  primary = -1;
866  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverPrimaryServer")) != NULL &&
867  tempbv[0] != NULL)
868  {
869  match = get_host_address (tempbv[0]->bv_val, srvaddr[0], sizeof(srvaddr[0]), addrs);
870  if (match >= 0)
871  {
872  /* we are the primary */
873  if (match > 0)
874  primary = 1;
875  }
876  else
877  {
878  log_info("Can't resolve address of the primary failover '%s' server %s",
879  peername[0]->bv_val, tempbv[0]->bv_val);
880  ldap_value_free_len (tempbv);
881  ldap_value_free_len (peername);
882  if (addrs)
883  freeifaddrs(addrs);
884  return;
885  }
886  }
887  if (tempbv != NULL)
888  ldap_value_free_len (tempbv);
889 
890  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverSecondaryServer")) != NULL &&
891  tempbv[0] != NULL)
892  {
893  match = get_host_address (tempbv[0]->bv_val, srvaddr[1], sizeof(srvaddr[1]), addrs);
894  if (match >= 0)
895  {
896  if (match > 0)
897  {
898  if (primary == 1)
899  {
900  log_info("Both, primary and secondary failover '%s' server"
901  " attributes match our local address", peername[0]->bv_val);
902  ldap_value_free_len (tempbv);
903  ldap_value_free_len (peername);
904  if (addrs)
905  freeifaddrs(addrs);
906  return;
907  }
908 
909  /* we are the secondary */
910  primary = 0;
911  }
912  }
913  else
914  {
915  log_info("Can't resolve address of the secondary failover '%s' server %s",
916  peername[0]->bv_val, tempbv[0]->bv_val);
917  ldap_value_free_len (tempbv);
918  ldap_value_free_len (peername);
919  if (addrs)
920  freeifaddrs(addrs);
921  return;
922  }
923  }
924  if (tempbv != NULL)
925  ldap_value_free_len (tempbv);
926 
927 
928  if (primary == -1 || srvaddr[0] == '\0' || srvaddr[1] == '\0')
929  {
930  log_error("Could not decide if the server type is primary"
931  " or secondary for failover peering '%s'.", peername[0]->bv_val);
932  ldap_value_free_len (peername);
933  if (addrs)
934  freeifaddrs(addrs);
935  return;
936  }
937 
938  x_parser_strcat (cfile, "failover peer \"");
939  x_parser_strcat (cfile, peername[0]->bv_val);
940  x_parser_strcat (cfile, "\" {\n");
941 
942  if (primary)
943  x_parser_strcat (cfile, "primary;\n");
944  else
945  x_parser_strcat (cfile, "secondary;\n");
946 
947  x_parser_strcat (cfile, "address ");
948  if (primary)
949  x_parser_strcat (cfile, srvaddr[0]);
950  else
951  x_parser_strcat (cfile, srvaddr[1]);
952  x_parser_strcat (cfile, ";\n");
953 
954  x_parser_strcat (cfile, "peer address ");
955  if (primary)
956  x_parser_strcat (cfile, srvaddr[1]);
957  else
958  x_parser_strcat (cfile, srvaddr[0]);
959  x_parser_strcat (cfile, ";\n");
960 
961  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverPrimaryPort")) != NULL &&
962  tempbv[0] != NULL)
963  {
964  if (primary)
965  x_parser_strcat (cfile, "port ");
966  else
967  x_parser_strcat (cfile, "peer port ");
968  x_parser_strcat (cfile, tempbv[0]->bv_val);
969  x_parser_strcat (cfile, ";\n");
970  }
971  if (tempbv != NULL)
972  ldap_value_free_len (tempbv);
973 
974  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverSecondaryPort")) != NULL &&
975  tempbv[0] != NULL)
976  {
977  if (primary)
978  x_parser_strcat (cfile, "peer port ");
979  else
980  x_parser_strcat (cfile, "port ");
981  x_parser_strcat (cfile, tempbv[0]->bv_val);
982  x_parser_strcat (cfile, ";\n");
983  }
984  if (tempbv != NULL)
985  ldap_value_free_len (tempbv);
986 
987  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverResponseDelay")) != NULL &&
988  tempbv[0] != NULL)
989  {
990  x_parser_strcat (cfile, "max-response-delay ");
991  x_parser_strcat (cfile, tempbv[0]->bv_val);
992  x_parser_strcat (cfile, ";\n");
993  }
994  if (tempbv != NULL)
995  ldap_value_free_len (tempbv);
996 
997  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverUnackedUpdates")) != NULL &&
998  tempbv[0] != NULL)
999  {
1000  x_parser_strcat (cfile, "max-unacked-updates ");
1001  x_parser_strcat (cfile, tempbv[0]->bv_val);
1002  x_parser_strcat (cfile, ";\n");
1003  }
1004  if (tempbv != NULL)
1005  ldap_value_free_len (tempbv);
1006 
1007  if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverLoadBalanceTime")) != NULL &&
1008  tempbv[0] != NULL)
1009  {
1010  x_parser_strcat (cfile, "load balance max seconds ");
1011  x_parser_strcat (cfile, tempbv[0]->bv_val);
1012  x_parser_strcat (cfile, ";\n");
1013  }
1014  if (tempbv != NULL)
1015  ldap_value_free_len (tempbv);
1016 
1017  tempbv = NULL;
1018  if (primary &&
1019  (tempbv = ldap_get_values_len (ld, item->ldent, "dhcpMaxClientLeadTime")) != NULL &&
1020  tempbv[0] != NULL)
1021  {
1022  x_parser_strcat (cfile, "mclt ");
1023  x_parser_strcat (cfile, tempbv[0]->bv_val);
1024  x_parser_strcat (cfile, ";\n");
1025  }
1026  if (tempbv != NULL)
1027  ldap_value_free_len (tempbv);
1028 
1029  tempbv = NULL;
1030  if (primary &&
1031  (tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverSplit")) != NULL &&
1032  tempbv[0] != NULL)
1033  {
1034  x_parser_strcat (cfile, "split ");
1035  x_parser_strcat (cfile, tempbv[0]->bv_val);
1036  x_parser_strcat (cfile, ";\n");
1037  split = 1;
1038  }
1039  if (tempbv != NULL)
1040  ldap_value_free_len (tempbv);
1041 
1042  tempbv = NULL;
1043  if (primary && !split &&
1044  (tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverHashBucketAssignment")) != NULL &&
1045  tempbv[0] != NULL)
1046  {
1047  x_parser_strcat (cfile, "hba ");
1048  x_parser_strcat (cfile, tempbv[0]->bv_val);
1049  x_parser_strcat (cfile, ";\n");
1050  }
1051  if (tempbv != NULL)
1052  ldap_value_free_len (tempbv);
1053 
1054  item->close_brace = 1;
1055 }
1056 #endif /* HAVE_IFADDRS_H */
1057 
1058 static void
1059 add_to_config_stack (LDAPMessage * res, LDAPMessage * ent)
1060 {
1061  struct ldap_config_stack *ns;
1062 
1063  ns = dmalloc (sizeof (*ns), MDL);
1064  if (!ns) {
1065  log_fatal ("no memory for add_to_config_stack()");
1066  }
1067 
1068  ns->res = res;
1069  ns->ldent = ent;
1070  ns->close_brace = 0;
1071  ns->processed = 0;
1072  ns->next = ldap_stack;
1073  ldap_stack = ns;
1074 }
1075 
1076 static void
1077 ldap_stop()
1078 {
1079  struct sigaction old, new;
1080 
1081  if (ld == NULL)
1082  return;
1083 
1084  /*
1085  ** ldap_unbind after a LDAP_SERVER_DOWN result
1086  ** causes a SIGPIPE and dhcpd gets terminated,
1087  ** since it doesn't handle it...
1088  */
1089 
1090  new.sa_flags = 0;
1091  new.sa_handler = SIG_IGN;
1092  sigemptyset (&new.sa_mask);
1093  sigaction (SIGPIPE, &new, &old);
1094 
1095  ldap_unbind_ext_s (ld, NULL, NULL);
1096  ld = NULL;
1097 
1098  sigaction (SIGPIPE, &old, &new);
1099 }
1100 
1101 
1102 static char *
1103 _do_lookup_dhcp_string_option (struct option_state *options, int option_name)
1104 {
1105  struct option_cache *oc;
1106  struct data_string db;
1107  char *ret;
1108 
1109  memset (&db, 0, sizeof (db));
1110  oc = lookup_option (&server_universe, options, option_name);
1111  if (oc &&
1112  evaluate_option_cache (&db, (struct packet*) NULL,
1113  (struct lease *) NULL,
1114  (struct client_state *) NULL, options,
1115  (struct option_state *) NULL,
1116  &global_scope, oc, MDL) &&
1117  db.data != NULL && *db.data != '\0')
1118 
1119  {
1120  ret = dmalloc (db.len + 1, MDL);
1121  if (ret == NULL)
1122  log_fatal ("no memory for ldap option %d value", option_name);
1123 
1124  memcpy (ret, db.data, db.len);
1125  ret[db.len] = 0;
1126  data_string_forget (&db, MDL);
1127  }
1128  else
1129  ret = NULL;
1130 
1131  return (ret);
1132 }
1133 
1134 
1135 static int
1136 _do_lookup_dhcp_int_option (struct option_state *options, int option_name)
1137 {
1138  struct option_cache *oc;
1139  struct data_string db;
1140  int ret;
1141 
1142  memset (&db, 0, sizeof (db));
1143  oc = lookup_option (&server_universe, options, option_name);
1144  if (oc &&
1145  evaluate_option_cache (&db, (struct packet*) NULL,
1146  (struct lease *) NULL,
1147  (struct client_state *) NULL, options,
1148  (struct option_state *) NULL,
1149  &global_scope, oc, MDL) &&
1150  db.data != NULL && *db.data != '\0')
1151  {
1152  ret = strtol ((const char *) db.data, NULL, 10);
1153  data_string_forget (&db, MDL);
1154  }
1155  else
1156  ret = 0;
1157 
1158  return (ret);
1159 }
1160 
1161 
1162 static int
1163 _do_lookup_dhcp_enum_option (struct option_state *options, int option_name)
1164 {
1165  struct option_cache *oc;
1166  struct data_string db;
1167  int ret = -1;
1168 
1169  memset (&db, 0, sizeof (db));
1170  oc = lookup_option (&server_universe, options, option_name);
1171  if (oc &&
1172  evaluate_option_cache (&db, (struct packet*) NULL,
1173  (struct lease *) NULL,
1174  (struct client_state *) NULL, options,
1175  (struct option_state *) NULL,
1176  &global_scope, oc, MDL) &&
1177  db.data != NULL && *db.data != '\0')
1178  {
1179  if (db.len == 1)
1180  ret = db.data [0];
1181  else
1182  log_fatal ("invalid option name %d", option_name);
1183 
1184  data_string_forget (&db, MDL);
1185  }
1186  else
1187  ret = 0;
1188 
1189  return (ret);
1190 }
1191 
1192 int
1193 ldap_rebind_cb (LDAP *ld, LDAP_CONST char *url, ber_tag_t request, ber_int_t msgid, void *parms)
1194 {
1195  int ret;
1196  LDAPURLDesc *ldapurl = NULL;
1197  char *who = NULL;
1198  struct berval creds;
1199 
1200  log_info("LDAP rebind to '%s'", url);
1201  if ((ret = ldap_url_parse(url, &ldapurl)) != LDAP_SUCCESS)
1202  {
1203  log_error ("Error: Can not parse ldap rebind url '%s': %s",
1204  url, ldap_err2string(ret));
1205  return ret;
1206  }
1207 
1208 
1209 #if defined (LDAP_USE_SSL)
1210  if (strcasecmp(ldapurl->lud_scheme, "ldaps") == 0)
1211  {
1212  int opt = LDAP_OPT_X_TLS_HARD;
1213  if ((ret = ldap_set_option (ld, LDAP_OPT_X_TLS, &opt)) != LDAP_SUCCESS)
1214  {
1215  log_error ("Error: Cannot init LDAPS session to %s:%d: %s",
1216  ldapurl->lud_host, ldapurl->lud_port, ldap_err2string (ret));
1217  ldap_free_urldesc(ldapurl);
1218  return ret;
1219  }
1220  else
1221  {
1222  log_info ("LDAPS session successfully enabled to %s", ldap_server);
1223  }
1224  }
1225  else
1226  if (strcasecmp(ldapurl->lud_scheme, "ldap") == 0 &&
1227  ldap_use_ssl != LDAP_SSL_OFF)
1228  {
1229  if ((ret = ldap_start_tls_s (ld, NULL, NULL)) != LDAP_SUCCESS)
1230  {
1231  log_error ("Error: Cannot start TLS session to %s:%d: %s",
1232  ldapurl->lud_host, ldapurl->lud_port, ldap_err2string (ret));
1233  ldap_free_urldesc(ldapurl);
1234  return ret;
1235  }
1236  else
1237  {
1238  log_info ("TLS session successfully started to %s:%d",
1239  ldapurl->lud_host, ldapurl->lud_port);
1240  }
1241  }
1242 #endif
1243 
1244 #if defined(LDAP_USE_GSSAPI)
1245  if (ldap_gssapi_principal != NULL) {
1246  krb5_get_tgt(ldap_gssapi_principal, ldap_gssapi_keytab);
1247  if ((ret = ldap_sasl_interactive_bind_s(ld, NULL, ldap_sasl_inst->sasl_mech,
1248  NULL, NULL, LDAP_SASL_AUTOMATIC,
1249  _ldap_sasl_interact, ldap_sasl_inst)
1250  ) != LDAP_SUCCESS)
1251  {
1252  log_error ("Error: Cannot SASL bind to ldap server %s:%d: %s",
1253  ldap_server, ldap_port, ldap_err2string (ret));
1254  char *msg=NULL;
1255  ldap_get_option( ld, LDAP_OPT_DIAGNOSTIC_MESSAGE, (void*)&msg);
1256  log_error ("\tAdditional info: %s", msg);
1257  ldap_memfree(msg);
1258  ldap_stop();
1259  }
1260 
1261  ldap_free_urldesc(ldapurl);
1262  return ret;
1263  }
1264 #endif
1265 
1266  if (ldap_username != NULL && *ldap_username != '\0' && ldap_password != NULL)
1267  {
1268  who = ldap_username;
1269  creds.bv_val = strdup(ldap_password);
1270  if (creds.bv_val == NULL)
1271  log_fatal ("Error: Unable to allocate memory to duplicate ldap_password");
1272 
1273  creds.bv_len = strlen(ldap_password);
1274 
1275  if ((ret = ldap_sasl_bind_s (ld, who, LDAP_SASL_SIMPLE, &creds,
1276  NULL, NULL, NULL)) != LDAP_SUCCESS)
1277  {
1278  log_error ("Error: Cannot login into ldap server %s:%d: %s",
1279  ldapurl->lud_host, ldapurl->lud_port, ldap_err2string (ret));
1280  }
1281 
1282  if (creds.bv_val)
1283  free(creds.bv_val);
1284  }
1285 
1286  ldap_free_urldesc(ldapurl);
1287  return ret;
1288 }
1289 
1290 static int
1291 _do_ldap_retry(int ret, const char *server, int port)
1292 {
1293  static int inform = 1;
1294 
1295  if (ldap_enable_retry > 0 && ret == LDAP_SERVER_DOWN && ldap_init_retry > 0)
1296  {
1297  if (inform || (ldap_init_retry % 10) == 0)
1298  {
1299  inform = 0;
1300  log_info ("Can't contact LDAP server %s:%d: retrying for %d sec",
1301  server, port, ldap_init_retry);
1302  }
1303  sleep(1);
1304  return ldap_init_retry--;
1305  }
1306  return 0;
1307 }
1308 
1309 static struct berval *
1310 _do_ldap_str2esc_filter_bv(const char *str, ber_len_t len, struct berval *bv_o)
1311 {
1312  struct berval bv_i;
1313 
1314  if (!str || !bv_o || (ber_str2bv(str, len, 0, &bv_i) == NULL) ||
1315  (ldap_bv2escaped_filter_value(&bv_i, bv_o) != 0))
1316  return NULL;
1317  return bv_o;
1318 }
1319 
1320 static void
1321 ldap_start (void)
1322 {
1323  struct option_state *options;
1324  int ret, version;
1325  char *uri = NULL;
1326  struct berval creds;
1327 #if defined(LDAP_USE_GSSAPI)
1328  char *gssapi_realm = NULL;
1329  char *gssapi_user = NULL;
1330  char *running = NULL;
1331  const char *gssapi_delim = "@";
1332 #endif
1333 
1334  if (ld != NULL)
1335  return;
1336 
1337  if (ldap_server == NULL)
1338  {
1339  options = NULL;
1340  option_state_allocate (&options, MDL);
1341 
1342  execute_statements_in_scope (NULL, NULL, NULL, NULL, NULL,
1343  options, &global_scope, root_group,
1344  NULL, NULL);
1345 
1346  ldap_server = _do_lookup_dhcp_string_option (options, SV_LDAP_SERVER);
1347  ldap_dhcp_server_cn = _do_lookup_dhcp_string_option (options,
1348  SV_LDAP_DHCP_SERVER_CN);
1349  ldap_port = _do_lookup_dhcp_int_option (options, SV_LDAP_PORT);
1350  ldap_base_dn = _do_lookup_dhcp_string_option (options, SV_LDAP_BASE_DN);
1351  ldap_method = _do_lookup_dhcp_enum_option (options, SV_LDAP_METHOD);
1352  ldap_debug_file = _do_lookup_dhcp_string_option (options,
1353  SV_LDAP_DEBUG_FILE);
1354  ldap_referrals = _do_lookup_dhcp_enum_option (options, SV_LDAP_REFERRALS);
1355  ldap_init_retry = _do_lookup_dhcp_int_option (options, SV_LDAP_INIT_RETRY);
1356 
1357 #if defined (LDAP_USE_SSL)
1358  ldap_use_ssl = _do_lookup_dhcp_enum_option (options, SV_LDAP_SSL);
1359  if( ldap_use_ssl != LDAP_SSL_OFF)
1360  {
1361  ldap_tls_reqcert = _do_lookup_dhcp_enum_option (options, SV_LDAP_TLS_REQCERT);
1362  ldap_tls_ca_file = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CA_FILE);
1363  ldap_tls_ca_dir = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CA_DIR);
1364  ldap_tls_cert = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CERT);
1365  ldap_tls_key = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_KEY);
1366  ldap_tls_crlcheck = _do_lookup_dhcp_enum_option (options, SV_LDAP_TLS_CRLCHECK);
1367  ldap_tls_ciphers = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CIPHERS);
1368  ldap_tls_randfile = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_RANDFILE);
1369  }
1370 #endif
1371 
1372 #if defined (LDAP_USE_GSSAPI)
1373  ldap_gssapi_principal = _do_lookup_dhcp_string_option (options,
1374  SV_LDAP_GSSAPI_PRINCIPAL);
1375 
1376  if (ldap_gssapi_principal == NULL) {
1377  log_error("ldap_gssapi_principal is not set,"
1378  "GSSAPI Authentication for LDAP will not be used");
1379  } else {
1380  ldap_gssapi_keytab = _do_lookup_dhcp_string_option (options,
1381  SV_LDAP_GSSAPI_KEYTAB);
1382  if (ldap_gssapi_keytab == NULL) {
1383  log_fatal("ldap_gssapi_keytab must be specified");
1384  }
1385 
1386  running = strdup(ldap_gssapi_principal);
1387  if (running == NULL)
1388  log_fatal("Could not allocate memory to duplicate gssapi principal");
1389 
1390  gssapi_user = strtok(running, gssapi_delim);
1391  if (!gssapi_user || strlen(gssapi_user) == 0) {
1392  log_fatal ("GSSAPI principal must specify user: user@realm");
1393  }
1394 
1395  gssapi_realm = strtok(NULL, gssapi_delim);
1396  if (!gssapi_realm || strlen(gssapi_realm) == 0) {
1397  log_fatal ("GSSAPI principal must specify realm: user@realm");
1398  }
1399 
1400  ldap_sasl_inst = malloc(sizeof(struct ldap_sasl_instance));
1401  if (ldap_sasl_inst == NULL)
1402  log_fatal("Could not allocate memory for sasl instance! Can not run!");
1403 
1404  ldap_sasl_inst->sasl_mech = ber_strdup("GSSAPI");
1405  if (ldap_sasl_inst->sasl_mech == NULL)
1406  log_fatal("Could not allocate memory to duplicate gssapi mechanism");
1407 
1408  ldap_sasl_inst->sasl_realm = ber_strdup(gssapi_realm);
1409  if (ldap_sasl_inst->sasl_realm == NULL)
1410  log_fatal("Could not allocate memory to duplicate gssapi realm");
1411 
1412  ldap_sasl_inst->sasl_authz_id = ber_strdup(gssapi_user);
1413  if (ldap_sasl_inst->sasl_authz_id == NULL)
1414  log_fatal("Could not allocate memory to duplicate gssapi user");
1415 
1416  ldap_sasl_inst->sasl_authc_id = NULL;
1417  ldap_sasl_inst->sasl_password = NULL; //"" before
1418  free(running);
1419  }
1420 #endif
1421 
1422 #if defined (LDAP_CASA_AUTH)
1423  if (!load_uname_pwd_from_miCASA(&ldap_username,&ldap_password))
1424  {
1425 #if defined (DEBUG_LDAP)
1426  log_info ("Authentication credential taken from file");
1427 #endif
1428 #endif
1429 
1430  ldap_username = _do_lookup_dhcp_string_option (options, SV_LDAP_USERNAME);
1431  ldap_password = _do_lookup_dhcp_string_option (options, SV_LDAP_PASSWORD);
1432 
1433 #if defined (LDAP_CASA_AUTH)
1434  }
1435 #endif
1436 
1437  option_state_dereference (&options, MDL);
1438  }
1439 
1440  if (ldap_server == NULL || ldap_base_dn == NULL)
1441  {
1442  log_info ("Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file");
1443  ldap_method = LDAP_METHOD_STATIC;
1444  return;
1445  }
1446 
1447  if (ldap_debug_file != NULL && ldap_debug_fd == -1)
1448  {
1449  if ((ldap_debug_fd = open (ldap_debug_file, O_CREAT | O_TRUNC | O_WRONLY | O_CLOEXEC,
1450  S_IRUSR | S_IWUSR)) < 0)
1451  log_error ("Error opening debug LDAP log file %s: %s", ldap_debug_file,
1452  strerror (errno));
1453  }
1454 
1455 #if defined (DEBUG_LDAP)
1456  log_info ("Connecting to LDAP server %s:%d", ldap_server, ldap_port);
1457 #endif
1458 
1459 #if defined (LDAP_USE_SSL)
1460  if (ldap_use_ssl == -1)
1461  {
1462  /*
1463  ** There was no "ldap-ssl" option in dhcpd.conf (also not "off").
1464  ** Let's try, if we can use an anonymous TLS session without to
1465  ** verify the server certificate -- if not continue without TLS.
1466  */
1467  int opt = LDAP_OPT_X_TLS_ALLOW;
1468  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_REQUIRE_CERT,
1469  &opt)) != LDAP_SUCCESS)
1470  {
1471  log_error ("Warning: Cannot set LDAP TLS require cert option to 'allow': %s",
1472  ldap_err2string (ret));
1473  }
1474  }
1475 
1476  if (ldap_use_ssl != LDAP_SSL_OFF)
1477  {
1478  if (ldap_tls_reqcert != -1)
1479  {
1480  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_REQUIRE_CERT,
1481  &ldap_tls_reqcert)) != LDAP_SUCCESS)
1482  {
1483  log_error ("Cannot set LDAP TLS require cert option: %s",
1484  ldap_err2string (ret));
1485  }
1486  }
1487 
1488  if( ldap_tls_ca_file != NULL)
1489  {
1490  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CACERTFILE,
1491  ldap_tls_ca_file)) != LDAP_SUCCESS)
1492  {
1493  log_error ("Cannot set LDAP TLS CA certificate file %s: %s",
1494  ldap_tls_ca_file, ldap_err2string (ret));
1495  }
1496  }
1497  if( ldap_tls_ca_dir != NULL)
1498  {
1499  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CACERTDIR,
1500  ldap_tls_ca_dir)) != LDAP_SUCCESS)
1501  {
1502  log_error ("Cannot set LDAP TLS CA certificate dir %s: %s",
1503  ldap_tls_ca_dir, ldap_err2string (ret));
1504  }
1505  }
1506  if( ldap_tls_cert != NULL)
1507  {
1508  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CERTFILE,
1509  ldap_tls_cert)) != LDAP_SUCCESS)
1510  {
1511  log_error ("Cannot set LDAP TLS client certificate file %s: %s",
1512  ldap_tls_cert, ldap_err2string (ret));
1513  }
1514  }
1515  if( ldap_tls_key != NULL)
1516  {
1517  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_KEYFILE,
1518  ldap_tls_key)) != LDAP_SUCCESS)
1519  {
1520  log_error ("Cannot set LDAP TLS certificate key file %s: %s",
1521  ldap_tls_key, ldap_err2string (ret));
1522  }
1523  }
1524  if( ldap_tls_crlcheck != -1)
1525  {
1526  int opt = ldap_tls_crlcheck;
1527  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CRLCHECK,
1528  &opt)) != LDAP_SUCCESS)
1529  {
1530  log_error ("Cannot set LDAP TLS crl check option: %s",
1531  ldap_err2string (ret));
1532  }
1533  }
1534  if( ldap_tls_ciphers != NULL)
1535  {
1536  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CIPHER_SUITE,
1537  ldap_tls_ciphers)) != LDAP_SUCCESS)
1538  {
1539  log_error ("Cannot set LDAP TLS cipher suite %s: %s",
1540  ldap_tls_ciphers, ldap_err2string (ret));
1541  }
1542  }
1543  if( ldap_tls_randfile != NULL)
1544  {
1545  if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_RANDOM_FILE,
1546  ldap_tls_randfile)) != LDAP_SUCCESS)
1547  {
1548  log_error ("Cannot set LDAP TLS random file %s: %s",
1549  ldap_tls_randfile, ldap_err2string (ret));
1550  }
1551  }
1552  }
1553 #endif
1554 
1555  /* enough for 'ldap://+ + hostname + ':' + port number */
1556  uri = malloc(strlen(ldap_server) + 16);
1557  if (uri == NULL)
1558  {
1559  log_error ("Cannot build ldap init URI %s:%d", ldap_server, ldap_port);
1560  return;
1561  }
1562 
1563  sprintf(uri, "ldap://%s:%d", ldap_server, ldap_port);
1564  ldap_initialize(&ld, uri);
1565 
1566  if (ld == NULL)
1567  {
1568  log_error ("Cannot init ldap session to %s:%d", ldap_server, ldap_port);
1569  return;
1570  }
1571 
1572  free(uri);
1573 
1574  version = LDAP_VERSION3;
1575  if ((ret = ldap_set_option (ld, LDAP_OPT_PROTOCOL_VERSION, &version)) != LDAP_OPT_SUCCESS)
1576  {
1577  log_error ("Cannot set LDAP version to %d: %s", version,
1578  ldap_err2string (ret));
1579  }
1580 
1581  if (ldap_referrals != -1)
1582  {
1583  if ((ret = ldap_set_option (ld, LDAP_OPT_REFERRALS, ldap_referrals ?
1584  LDAP_OPT_ON : LDAP_OPT_OFF)) != LDAP_OPT_SUCCESS)
1585  {
1586  log_error ("Cannot %s LDAP referrals option: %s",
1587  (ldap_referrals ? "enable" : "disable"),
1588  ldap_err2string (ret));
1589  }
1590  }
1591 
1592  if ((ret = ldap_set_rebind_proc(ld, ldap_rebind_cb, NULL)) != LDAP_SUCCESS)
1593  {
1594  log_error ("Warning: Cannot set ldap rebind procedure: %s",
1595  ldap_err2string (ret));
1596  }
1597 
1598 #if defined (LDAP_USE_SSL)
1599  if (ldap_use_ssl == LDAP_SSL_LDAPS ||
1600  (ldap_use_ssl == LDAP_SSL_ON && ldap_port == LDAPS_PORT))
1601  {
1602  int opt = LDAP_OPT_X_TLS_HARD;
1603  if ((ret = ldap_set_option (ld, LDAP_OPT_X_TLS, &opt)) != LDAP_SUCCESS)
1604  {
1605  log_error ("Error: Cannot init LDAPS session to %s:%d: %s",
1606  ldap_server, ldap_port, ldap_err2string (ret));
1607  ldap_stop();
1608  return;
1609  }
1610  else
1611  {
1612  log_info ("LDAPS session successfully enabled to %s:%d",
1613  ldap_server, ldap_port);
1614  }
1615  }
1616  else if (ldap_use_ssl != LDAP_SSL_OFF)
1617  {
1618  do
1619  {
1620  ret = ldap_start_tls_s (ld, NULL, NULL);
1621  }
1622  while(_do_ldap_retry(ret, ldap_server, ldap_port) > 0);
1623 
1624  if (ret != LDAP_SUCCESS)
1625  {
1626  log_error ("Error: Cannot start TLS session to %s:%d: %s",
1627  ldap_server, ldap_port, ldap_err2string (ret));
1628  ldap_stop();
1629  return;
1630  }
1631  else
1632  {
1633  log_info ("TLS session successfully started to %s:%d",
1634  ldap_server, ldap_port);
1635  }
1636  }
1637 #endif
1638 
1639 #if defined(LDAP_USE_GSSAPI)
1640  if (ldap_gssapi_principal != NULL) {
1641  krb5_get_tgt(ldap_gssapi_principal, ldap_gssapi_keytab);
1642  if ((ret = ldap_sasl_interactive_bind_s(ld, NULL, ldap_sasl_inst->sasl_mech,
1643  NULL, NULL, LDAP_SASL_AUTOMATIC,
1644  _ldap_sasl_interact, ldap_sasl_inst)
1645  ) != LDAP_SUCCESS)
1646  {
1647  log_error ("Error: Cannot SASL bind to ldap server %s:%d: %s",
1648  ldap_server, ldap_port, ldap_err2string (ret));
1649  char *msg=NULL;
1650  ldap_get_option( ld, LDAP_OPT_DIAGNOSTIC_MESSAGE, (void*)&msg);
1651  log_error ("\tAdditional info: %s", msg);
1652  ldap_memfree(msg);
1653  ldap_stop();
1654  return;
1655  }
1656  } else
1657 #endif
1658 
1659  if (ldap_username != NULL && *ldap_username != '\0' && ldap_password != NULL)
1660  {
1661  creds.bv_val = strdup(ldap_password);
1662  if (creds.bv_val == NULL)
1663  log_fatal ("Error: Unable to allocate memory to duplicate ldap_password");
1664 
1665  creds.bv_len = strlen(ldap_password);
1666 
1667  do
1668  {
1669  ret = ldap_sasl_bind_s (ld, ldap_username, LDAP_SASL_SIMPLE,
1670  &creds, NULL, NULL, NULL);
1671  }
1672  while(_do_ldap_retry(ret, ldap_server, ldap_port) > 0);
1673  free(creds.bv_val);
1674 
1675  if (ret != LDAP_SUCCESS)
1676  {
1677  log_error ("Error: Cannot login into ldap server %s:%d: %s",
1678  ldap_server, ldap_port, ldap_err2string (ret));
1679  ldap_stop();
1680  return;
1681  }
1682  }
1683 
1684 #if defined (DEBUG_LDAP)
1685  log_info ("Successfully logged into LDAP server %s", ldap_server);
1686 #endif
1687 }
1688 
1689 
1690 static void
1691 parse_external_dns (LDAPMessage * ent)
1692 {
1693  char *search[] = {"dhcpOptionsDN", "dhcpSharedNetworkDN", "dhcpSubnetDN",
1694  "dhcpGroupDN", "dhcpHostDN", "dhcpClassesDN",
1695  "dhcpPoolDN", "dhcpZoneDN", "dhcpFailOverPeerDN", NULL};
1696 
1697  /* TODO: dhcpKeyDN can't be added. It is referenced in dhcpDnsZone to
1698  retrive the key name (cn). Adding keyDN will reflect adding a key
1699  declaration inside the zone configuration.
1700 
1701  dhcpSubClassesDN cant be added. It is also similar to the above.
1702  Needs schema change.
1703  */
1704  LDAPMessage * newres, * newent;
1705  struct berval **tempbv;
1706  int i, j, ret;
1707 #if defined (DEBUG_LDAP)
1708  char *dn;
1709 
1710  dn = ldap_get_dn (ld, ent);
1711  if (dn != NULL)
1712  {
1713  log_info ("Parsing external DNs for '%s'", dn);
1714  ldap_memfree (dn);
1715  }
1716 #endif
1717 
1718  if (ld == NULL)
1719  ldap_start ();
1720  if (ld == NULL)
1721  return;
1722 
1723  for (i=0; search[i] != NULL; i++)
1724  {
1725  if ((tempbv = ldap_get_values_len (ld, ent, search[i])) == NULL)
1726  continue;
1727 
1728  for (j=0; tempbv[j] != NULL; j++)
1729  {
1730  if (*tempbv[j]->bv_val == '\0')
1731  continue;
1732 
1733  if ((ret = ldap_search_ext_s(ld, tempbv[j]->bv_val, LDAP_SCOPE_BASE,
1734  "objectClass=*", NULL, 0, NULL,
1735  NULL, NULL, 0, &newres)) != LDAP_SUCCESS)
1736  {
1737  ldap_value_free_len (tempbv);
1738  ldap_stop();
1739  return;
1740  }
1741 
1742 #if defined (DEBUG_LDAP)
1743  log_info ("Adding contents of subtree '%s' to config stack from '%s' reference", tempbv[j]->bv_val, search[i]);
1744 #endif
1745  for (newent = ldap_first_entry (ld, newres);
1746  newent != NULL;
1747  newent = ldap_next_entry (ld, newent))
1748  {
1749 #if defined (DEBUG_LDAP)
1750  dn = ldap_get_dn (ld, newent);
1751  if (dn != NULL)
1752  {
1753  log_info ("Adding LDAP result set starting with '%s' to config stack", dn);
1754  ldap_memfree (dn);
1755  }
1756 #endif
1757 
1758  add_to_config_stack (newres, newent);
1759  /* don't free newres here */
1760  }
1761  }
1762 
1763  ldap_value_free_len (tempbv);
1764  }
1765 }
1766 
1767 
1768 static void
1769 free_stack_entry (struct ldap_config_stack *item)
1770 {
1771  struct ldap_config_stack *look_ahead_pointer = item;
1772  int may_free_msg = 1;
1773 
1774  while (look_ahead_pointer->next != NULL)
1775  {
1776  look_ahead_pointer = look_ahead_pointer->next;
1777  if (look_ahead_pointer->res == item->res)
1778  {
1779  may_free_msg = 0;
1780  break;
1781  }
1782  }
1783 
1784  if (may_free_msg)
1785  ldap_msgfree (item->res);
1786 
1787  dfree (item, MDL);
1788 }
1789 
1790 
1791 static void
1792 next_ldap_entry (struct parse *cfile)
1793 {
1794  struct ldap_config_stack *temp_stack;
1795 
1796  if (ldap_stack != NULL && ldap_stack->close_brace)
1797  {
1798  x_parser_strcat (cfile, "}\n");
1799  ldap_stack->close_brace = 0;
1800  }
1801 
1802  while (ldap_stack != NULL &&
1803  (ldap_stack->ldent == NULL || ( ldap_stack->processed &&
1804  (ldap_stack->ldent = ldap_next_entry (ld, ldap_stack->ldent)) == NULL)))
1805  {
1806  if (ldap_stack->close_brace)
1807  {
1808  x_parser_strcat (cfile, "}\n");
1809  ldap_stack->close_brace = 0;
1810  }
1811 
1812  temp_stack = ldap_stack;
1813  ldap_stack = ldap_stack->next;
1814  free_stack_entry (temp_stack);
1815  }
1816 
1817  if (ldap_stack != NULL && ldap_stack->close_brace)
1818  {
1819  x_parser_strcat (cfile, "}\n");
1820  ldap_stack->close_brace = 0;
1821  }
1822 }
1823 
1824 
1825 static char
1826 check_statement_end (const char *statement)
1827 {
1828  char *ptr;
1829 
1830  if (statement == NULL || *statement == '\0')
1831  return ('\0');
1832 
1833  /*
1834  ** check if it ends with "}", e.g.:
1835  ** "zone my.domain. { ... }"
1836  ** optionally followed by spaces
1837  */
1838  ptr = strrchr (statement, '}');
1839  if (ptr != NULL)
1840  {
1841  /* skip following white-spaces */
1842  for (++ptr; isspace ((int)*ptr); ptr++);
1843 
1844  /* check if we reached the end */
1845  if (*ptr == '\0')
1846  return ('}'); /* yes, block end */
1847  else
1848  return (*ptr);
1849  }
1850 
1851  /*
1852  ** this should not happen, but...
1853  ** check if it ends with ";", e.g.:
1854  ** "authoritative;"
1855  ** optionally followed by spaces
1856  */
1857  ptr = strrchr (statement, ';');
1858  if (ptr != NULL)
1859  {
1860  /* skip following white-spaces */
1861  for (++ptr; isspace ((int)*ptr); ptr++);
1862 
1863  /* check if we reached the end */
1864  if (*ptr == '\0')
1865  return (';'); /* ends with a ; */
1866  else
1867  return (*ptr);
1868  }
1869 
1870  return ('\0');
1871 }
1872 
1873 
1874 static isc_result_t
1875 ldap_parse_entry_options (LDAPMessage *ent, struct parse *cfile,
1876  int *lease_limit)
1877 {
1878  struct berval **tempbv;
1879  int i;
1880 
1881  if (ent == NULL || cfile == NULL)
1882  return (ISC_R_FAILURE);
1883 
1884  if ((tempbv = ldap_get_values_len (ld, ent, "dhcpStatements")) != NULL)
1885  {
1886  for (i=0; tempbv[i] != NULL; i++)
1887  {
1888  if (lease_limit != NULL &&
1889  strncasecmp ("lease limit ", tempbv[i]->bv_val, 12) == 0)
1890  {
1891  *lease_limit = (int) strtol ((tempbv[i]->bv_val) + 12, NULL, 10);
1892  continue;
1893  }
1894 
1895  x_parser_strcat (cfile, tempbv[i]->bv_val);
1896 
1897  switch((int) check_statement_end (tempbv[i]->bv_val))
1898  {
1899  case '}':
1900  case ';':
1901  x_parser_strcat (cfile, "\n");
1902  break;
1903  default:
1904  x_parser_strcat (cfile, ";\n");
1905  break;
1906  }
1907  }
1908  ldap_value_free_len (tempbv);
1909  }
1910 
1911  if ((tempbv = ldap_get_values_len (ld, ent, "dhcpOption")) != NULL)
1912  {
1913  for (i=0; tempbv[i] != NULL; i++)
1914  {
1915  x_parser_strcat (cfile, "option ");
1916  x_parser_strcat (cfile, tempbv[i]->bv_val);
1917  switch ((int) check_statement_end (tempbv[i]->bv_val))
1918  {
1919  case ';':
1920  x_parser_strcat (cfile, "\n");
1921  break;
1922  default:
1923  x_parser_strcat (cfile, ";\n");
1924  break;
1925  }
1926  }
1927  ldap_value_free_len (tempbv);
1928  }
1929 
1930  return (ISC_R_SUCCESS);
1931 }
1932 
1933 
1934 static void
1935 ldap_generate_config_string (struct parse *cfile)
1936 {
1937  struct berval **objectClass;
1938  char *dn;
1939  struct ldap_config_stack *entry;
1940  LDAPMessage * ent, * res, *entfirst, *resfirst;
1941  int i, ignore, found;
1942  int ret, parsedn = 1;
1943  size_t len = cfile->buflen;
1944 
1945  if (ld == NULL)
1946  ldap_start ();
1947  if (ld == NULL)
1948  return;
1949 
1950  entry = ldap_stack;
1951  if ((objectClass = ldap_get_values_len (ld, entry->ldent,
1952  "objectClass")) == NULL)
1953  return;
1954 
1955  entry->processed = 1;
1956  ignore = 0;
1957  found = 1;
1958  for (i=0; objectClass[i] != NULL; i++)
1959  {
1960  if (strcasecmp (objectClass[i]->bv_val, "dhcpSharedNetwork") == 0)
1961  ldap_parse_shared_network (entry, cfile);
1962  else if (strcasecmp (objectClass[i]->bv_val, "dhcpClass") == 0)
1963  ldap_parse_class (entry, cfile);
1964  else if (strcasecmp (objectClass[i]->bv_val, "dhcpSubnet") == 0)
1965  ldap_parse_subnet (entry, cfile);
1966  else if (strcasecmp (objectClass[i]->bv_val, "dhcpSubnet6") == 0)
1967  ldap_parse_subnet6 (entry, cfile);
1968  else if (strcasecmp (objectClass[i]->bv_val, "dhcpPool") == 0)
1969  ldap_parse_pool (entry, cfile);
1970  else if (strcasecmp (objectClass[i]->bv_val, "dhcpPool6") == 0)
1971  ldap_parse_pool6 (entry, cfile);
1972  else if (strcasecmp (objectClass[i]->bv_val, "dhcpGroup") == 0)
1973  ldap_parse_group (entry, cfile);
1974  else if (strcasecmp (objectClass[i]->bv_val, "dhcpTSigKey") == 0)
1975  ldap_parse_key (entry, cfile);
1976  else if (strcasecmp (objectClass[i]->bv_val, "dhcpDnsZone") == 0)
1977  ldap_parse_zone (entry, cfile);
1978 #if defined(HAVE_IFADDRS_H)
1979  else if (strcasecmp (objectClass[i]->bv_val, "dhcpFailOverPeer") == 0)
1980  ldap_parse_failover (entry, cfile);
1981 #endif
1982  else if (strcasecmp (objectClass[i]->bv_val, "dhcpHost") == 0)
1983  {
1984  if (ldap_method == LDAP_METHOD_STATIC)
1985  ldap_parse_host (entry, cfile);
1986  else
1987  {
1988  ignore = 1;
1989  break;
1990  }
1991  }
1992  else if (strcasecmp (objectClass[i]->bv_val, "dhcpSubClass") == 0)
1993  {
1994  if (ldap_method == LDAP_METHOD_STATIC)
1995  ldap_parse_subclass (entry, cfile);
1996  else
1997  {
1998  ignore = 1;
1999  break;
2000  }
2001  }
2002  else
2003  found = 0;
2004 
2005  if (found && x_parser_length(cfile) <= len)
2006  {
2007  ignore = 1;
2008  break;
2009  }
2010  }
2011 
2012  ldap_value_free_len (objectClass);
2013 
2014  if (ignore)
2015  {
2016  next_ldap_entry (cfile);
2017  return;
2018  }
2019 
2020  ldap_parse_entry_options(entry->ldent, cfile, NULL);
2021 
2022  dn = ldap_get_dn (ld, entry->ldent);
2023  if (dn == NULL)
2024  {
2025  ldap_stop();
2026  return;
2027  }
2028 #if defined(DEBUG_LDAP)
2029  log_info ("Found LDAP entry '%s'", dn);
2030 #endif
2031 
2032  if ((ret = ldap_search_ext_s (ld, dn, LDAP_SCOPE_ONELEVEL,
2033  "(!(|(|(objectClass=dhcpTSigKey)(objectClass=dhcpClass)) (objectClass=dhcpFailOverPeer)))",
2034  NULL, 0, NULL, NULL,
2035  NULL, 0, &res)) != LDAP_SUCCESS)
2036  {
2037  ldap_memfree (dn);
2038 
2039  ldap_stop();
2040  return;
2041  }
2042 
2043  if ((ret = ldap_search_ext_s (ld, dn, LDAP_SCOPE_ONELEVEL,
2044  "(|(|(objectClass=dhcpTSigKey)(objectClass=dhcpClass)) (objectClass=dhcpFailOverPeer))",
2045  NULL, 0, NULL, NULL,
2046  NULL, 0, &resfirst)) != LDAP_SUCCESS)
2047  {
2048  ldap_memfree (dn);
2049  ldap_msgfree (res);
2050 
2051  ldap_stop();
2052  return;
2053  }
2054 
2055  ldap_memfree (dn);
2056 
2057  ent = ldap_first_entry(ld, res);
2058  entfirst = ldap_first_entry(ld, resfirst);
2059 
2060  if (ent == NULL && entfirst == NULL)
2061  {
2062  parse_external_dns (entry->ldent);
2063  next_ldap_entry (cfile);
2064  }
2065 
2066  if (ent != NULL)
2067  {
2068  add_to_config_stack (res, ent);
2069  parse_external_dns (entry->ldent);
2070  parsedn = 0;
2071  }
2072  else
2073  ldap_msgfree (res);
2074 
2075  if (entfirst != NULL)
2076  {
2077  add_to_config_stack (resfirst, entfirst);
2078  if(parsedn)
2079  parse_external_dns (entry->ldent);
2080 
2081  }
2082  else
2083  ldap_msgfree (resfirst);
2084 }
2085 
2086 
2087 static void
2088 ldap_close_debug_fd()
2089 {
2090  if (ldap_debug_fd != -1)
2091  {
2092  close (ldap_debug_fd);
2093  ldap_debug_fd = -1;
2094  }
2095 }
2096 
2097 
2098 static void
2099 ldap_write_debug (const void *buff, size_t size)
2100 {
2101  if (ldap_debug_fd != -1)
2102  {
2103  if (write (ldap_debug_fd, buff, size) < 0)
2104  {
2105  log_error ("Error writing to LDAP debug file %s: %s."
2106  " Disabling log file.", ldap_debug_file,
2107  strerror (errno));
2108  ldap_close_debug_fd();
2109  }
2110  }
2111 }
2112 
2113 static int
2114 ldap_read_function (struct parse *cfile)
2115 {
2116  size_t len;
2117 
2118  /* append when in saved state */
2119  if (cfile->saved_state == NULL)
2120  {
2121  cfile->inbuf[0] = '\0';
2122  cfile->bufix = 0;
2123  cfile->buflen = 0;
2124  }
2125  len = cfile->buflen;
2126 
2127  while (ldap_stack != NULL && x_parser_length(cfile) <= len)
2128  ldap_generate_config_string (cfile);
2129 
2130  if (x_parser_length(cfile) <= len && ldap_stack == NULL)
2131  return (EOF);
2132 
2133  if (cfile->buflen > len)
2134  ldap_write_debug (cfile->inbuf + len, cfile->buflen - len);
2135 #if defined (DEBUG_LDAP)
2136  log_info ("Sending config portion '%s'", cfile->inbuf + len);
2137 #endif
2138 
2139  return (cfile->inbuf[cfile->bufix++]);
2140 }
2141 
2142 
2143 static char *
2144 ldap_get_host_name (LDAPMessage * ent)
2145 {
2146  struct berval **name;
2147  char *ret;
2148 
2149  ret = NULL;
2150  if ((name = ldap_get_values_len (ld, ent, "cn")) == NULL || name[0] == NULL)
2151  {
2152  if (name != NULL)
2153  ldap_value_free_len (name);
2154 
2155 #if defined (DEBUG_LDAP)
2156  ret = ldap_get_dn (ld, ent);
2157  if (ret != NULL)
2158  {
2159  log_info ("Cannot get cn attribute for LDAP entry %s", ret);
2160  ldap_memfree(ret);
2161  }
2162 #endif
2163  return (NULL);
2164  }
2165 
2166  ret = dmalloc (strlen (name[0]->bv_val) + 1, MDL);
2167  strcpy (ret, name[0]->bv_val);
2168  ldap_value_free_len (name);
2169 
2170  return (ret);
2171 }
2172 
2173 
2174 isc_result_t
2175 ldap_read_config (void)
2176 {
2177  LDAPMessage * ldres, * hostres, * ent, * hostent;
2178  char hfilter[1024], sfilter[1024], fqdn[257];
2179  char *hostdn;
2180  ldap_dn_node *curr = NULL;
2181  struct parse *cfile;
2182  struct utsname unme;
2183  isc_result_t res;
2184  size_t length;
2185  int ret, cnt;
2186  struct berval **tempbv = NULL;
2187  struct berval bv_o[2];
2188 
2189  cfile = x_parser_init("LDAP");
2190  if (cfile == NULL)
2191  return (ISC_R_NOMEMORY);
2192 
2193  ldap_enable_retry = 1;
2194  if (ld == NULL)
2195  ldap_start ();
2196  ldap_enable_retry = 0;
2197 
2198  if (ld == NULL)
2199  {
2200  x_parser_free(&cfile);
2201  return (ldap_server == NULL ? ISC_R_SUCCESS : ISC_R_FAILURE);
2202  }
2203 
2204  uname (&unme);
2205  if (ldap_dhcp_server_cn != NULL)
2206  {
2207  if (_do_ldap_str2esc_filter_bv(ldap_dhcp_server_cn, 0, &bv_o[0]) == NULL)
2208  {
2209  log_error ("Cannot escape ldap filter value %s: %m", ldap_dhcp_server_cn);
2210  x_parser_free(&cfile);
2211  return (ISC_R_FAILURE);
2212  }
2213 
2214  snprintf (hfilter, sizeof (hfilter),
2215  "(&(objectClass=dhcpServer)(cn=%s))", bv_o[0].bv_val);
2216 
2217  ber_memfree(bv_o[0].bv_val);
2218  }
2219  else
2220  {
2221  if (_do_ldap_str2esc_filter_bv(unme.nodename, 0, &bv_o[0]) == NULL)
2222  {
2223  log_error ("Cannot escape ldap filter value %s: %m", unme.nodename);
2224  x_parser_free(&cfile);
2225  return (ISC_R_FAILURE);
2226  }
2227 
2228  *fqdn ='\0';
2229  if(0 == get_host_entry(fqdn, sizeof(fqdn), NULL, 0))
2230  {
2231  if (_do_ldap_str2esc_filter_bv(fqdn, 0, &bv_o[1]) == NULL)
2232  {
2233  log_error ("Cannot escape ldap filter value %s: %m", fqdn);
2234  ber_memfree(bv_o[0].bv_val);
2235  x_parser_free(&cfile);
2236  return (ISC_R_FAILURE);
2237  }
2238  }
2239 
2240  // If we have fqdn and it isn't the same as nodename, use it in filter
2241  // otherwise just use nodename
2242  if ((*fqdn) && (strcmp(unme.nodename, fqdn))) {
2243  snprintf (hfilter, sizeof (hfilter),
2244  "(&(objectClass=dhcpServer)(|(cn=%s)(cn=%s)))",
2245  bv_o[0].bv_val, bv_o[1].bv_val);
2246 
2247  ber_memfree(bv_o[1].bv_val);
2248  }
2249  else
2250  {
2251  snprintf (hfilter, sizeof (hfilter),
2252  "(&(objectClass=dhcpServer)(cn=%s))",
2253  bv_o[0].bv_val);
2254  }
2255 
2256  ber_memfree(bv_o[0].bv_val);
2257  }
2258 
2259  ldap_enable_retry = 1;
2260  do
2261  {
2262  hostres = NULL;
2263  ret = ldap_search_ext_s (ld, ldap_base_dn, LDAP_SCOPE_SUBTREE,
2264  hfilter, NULL, 0, NULL, NULL, NULL, 0,
2265  &hostres);
2266  }
2267  while(_do_ldap_retry(ret, ldap_server, ldap_port) > 0);
2268  ldap_enable_retry = 0;
2269 
2270  if(ret != LDAP_SUCCESS)
2271  {
2272  log_error ("Cannot find host LDAP entry %s %s",
2273  ((ldap_dhcp_server_cn == NULL)?(unme.nodename):(ldap_dhcp_server_cn)), hfilter);
2274  if(NULL != hostres)
2275  ldap_msgfree (hostres);
2276  ldap_stop();
2277  x_parser_free(&cfile);
2278  return (ISC_R_FAILURE);
2279  }
2280 
2281  if ((hostent = ldap_first_entry (ld, hostres)) == NULL)
2282  {
2283  log_error ("Error: Cannot find LDAP entry matching %s", hfilter);
2284  ldap_msgfree (hostres);
2285  ldap_stop();
2286  x_parser_free(&cfile);
2287  return (ISC_R_FAILURE);
2288  }
2289 
2290  hostdn = ldap_get_dn (ld, hostent);
2291 #if defined(DEBUG_LDAP)
2292  if (hostdn != NULL)
2293  log_info ("Found dhcpServer LDAP entry '%s'", hostdn);
2294 #endif
2295 
2296  if (hostdn == NULL ||
2297  (tempbv = ldap_get_values_len (ld, hostent, "dhcpServiceDN")) == NULL ||
2298  tempbv[0] == NULL)
2299  {
2300  log_error ("Error: No dhcp service is associated with the server %s %s",
2301  (hostdn ? "dn" : "name"), (hostdn ? hostdn :
2302  (ldap_dhcp_server_cn ? ldap_dhcp_server_cn : unme.nodename)));
2303 
2304  if (tempbv != NULL)
2305  ldap_value_free_len (tempbv);
2306 
2307  if (hostdn)
2308  ldap_memfree (hostdn);
2309  ldap_msgfree (hostres);
2310  ldap_stop();
2311  x_parser_free(&cfile);
2312  return (ISC_R_FAILURE);
2313  }
2314 
2315 #if defined(DEBUG_LDAP)
2316  log_info ("LDAP: Parsing dhcpServer options '%s' ...", hostdn);
2317 #endif
2318 
2319  res = ldap_parse_entry_options(hostent, cfile, NULL);
2320  if (res != ISC_R_SUCCESS)
2321  {
2322  ldap_value_free_len (tempbv);
2323  ldap_msgfree (hostres);
2324  ldap_memfree (hostdn);
2325  ldap_stop();
2326  x_parser_free(&cfile);
2327  return res;
2328  }
2329 
2330  if (x_parser_length(cfile) > 0)
2331  {
2332  ldap_write_debug(cfile->inbuf, cfile->buflen);
2333 
2334  res = conf_file_subparse (cfile, root_group, ROOT_GROUP);
2335  if (res != ISC_R_SUCCESS)
2336  {
2337  log_error ("LDAP: cannot parse dhcpServer entry '%s'", hostdn);
2338  ldap_value_free_len (tempbv);
2339  ldap_msgfree (hostres);
2340  ldap_memfree (hostdn);
2341  ldap_stop();
2342  x_parser_free(&cfile);
2343  return res;
2344  }
2345  x_parser_reset(cfile);
2346  }
2347  ldap_msgfree (hostres);
2348 
2349  res = ISC_R_SUCCESS;
2350  for (cnt=0; tempbv[cnt] != NULL; cnt++)
2351  {
2352 
2353  if (_do_ldap_str2esc_filter_bv(hostdn, 0, &bv_o[0]) == NULL)
2354  {
2355  log_error ("Cannot escape ldap filter value %s: %m", hostdn);
2356  res = ISC_R_FAILURE;
2357  break;
2358  }
2359 
2360  snprintf(sfilter, sizeof(sfilter), "(&(objectClass=dhcpService)"
2361  "(|(|(dhcpPrimaryDN=%s)(dhcpSecondaryDN=%s))(dhcpServerDN=%s)))",
2362  bv_o[0].bv_val, bv_o[0].bv_val, bv_o[0].bv_val);
2363 
2364  ber_memfree(bv_o[0].bv_val);
2365 
2366  ldres = NULL;
2367  if ((ret = ldap_search_ext_s (ld, tempbv[cnt]->bv_val, LDAP_SCOPE_BASE,
2368  sfilter, NULL, 0, NULL, NULL, NULL,
2369  0, &ldres)) != LDAP_SUCCESS)
2370  {
2371  log_error ("Error searching for dhcpServiceDN '%s': %s. Please update the LDAP entry '%s'",
2372  tempbv[cnt]->bv_val, ldap_err2string (ret), hostdn);
2373  if(NULL != ldres)
2374  ldap_msgfree(ldres);
2375  res = ISC_R_FAILURE;
2376  break;
2377  }
2378 
2379  if ((ent = ldap_first_entry (ld, ldres)) == NULL)
2380  {
2381  log_error ("Error: Cannot find dhcpService DN '%s' with server reference. Please update the LDAP server entry '%s'",
2382  tempbv[cnt]->bv_val, hostdn);
2383 
2384  ldap_msgfree(ldres);
2385  res = ISC_R_FAILURE;
2386  break;
2387  }
2388 
2389  /*
2390  ** FIXME: how to free the remembered dn's on exit?
2391  ** This should be OK if dmalloc registers the
2392  ** memory it allocated and frees it on exit..
2393  */
2394 
2395  curr = dmalloc (sizeof (*curr), MDL);
2396  if (curr != NULL)
2397  {
2398  length = strlen (tempbv[cnt]->bv_val);
2399  curr->dn = dmalloc (length + 1, MDL);
2400  if (curr->dn == NULL)
2401  {
2402  dfree (curr, MDL);
2403  curr = NULL;
2404  }
2405  else
2406  strcpy (curr->dn, tempbv[cnt]->bv_val);
2407  }
2408 
2409  if (curr != NULL)
2410  {
2411  curr->refs++;
2412 
2413  /* append to service-dn list */
2414  if (ldap_service_dn_tail != NULL)
2415  ldap_service_dn_tail->next = curr;
2416  else
2417  ldap_service_dn_head = curr;
2418 
2419  ldap_service_dn_tail = curr;
2420  }
2421  else
2422  log_fatal ("no memory to remember ldap service dn");
2423 
2424 #if defined (DEBUG_LDAP)
2425  log_info ("LDAP: Parsing dhcpService DN '%s' ...", tempbv[cnt]->bv_val);
2426 #endif
2427  add_to_config_stack (ldres, ent);
2428  res = conf_file_subparse (cfile, root_group, ROOT_GROUP);
2429  if (res != ISC_R_SUCCESS)
2430  {
2431  log_error ("LDAP: cannot parse dhcpService entry '%s'", tempbv[cnt]->bv_val);
2432  break;
2433  }
2434  }
2435 
2436  x_parser_free(&cfile);
2437  ldap_close_debug_fd();
2438 
2439  ldap_memfree (hostdn);
2440  ldap_value_free_len (tempbv);
2441 
2442  if (res != ISC_R_SUCCESS)
2443  {
2444  struct ldap_config_stack *temp_stack;
2445 
2446  while ((curr = ldap_service_dn_head) != NULL)
2447  {
2448  ldap_service_dn_head = curr->next;
2449  dfree (curr->dn, MDL);
2450  dfree (curr, MDL);
2451  }
2452 
2453  ldap_service_dn_tail = NULL;
2454 
2455  while ((temp_stack = ldap_stack) != NULL)
2456  {
2457  ldap_stack = temp_stack->next;
2458  free_stack_entry (temp_stack);
2459  }
2460 
2461  ldap_stop();
2462  }
2463 
2464  /* Unbind from ldap immediately after reading config in static mode. */
2465  if (ldap_method == LDAP_METHOD_STATIC)
2466  ldap_stop();
2467 
2468  return (res);
2469 }
2470 
2471 
2472 /* This function will parse the dhcpOption and dhcpStatements field in the LDAP
2473  entry if it exists. Right now, type will be either HOST_DECL or CLASS_DECL.
2474  If we are parsing a HOST_DECL, this always returns 0. If we are parsing a
2475  CLASS_DECL, this will return what the current lease limit is in LDAP. If
2476  there is no lease limit specified, we return 0 */
2477 
2478 static int
2479 ldap_parse_options (LDAPMessage * ent, struct group *group,
2480  int type, struct host_decl *host,
2481  struct class **class)
2482 {
2483  int declaration, lease_limit;
2484  enum dhcp_token token;
2485  struct parse *cfile;
2486  isc_result_t res;
2487  const char *val;
2488 
2489  lease_limit = 0;
2490  cfile = x_parser_init(type == HOST_DECL ? "LDAP-HOST" : "LDAP-SUBCLASS");
2491  if (cfile == NULL)
2492  return (lease_limit);
2493 
2494  /* This block of code will try to find the parent of the host, and
2495  if it is a group object, fetch the options and apply to the host. */
2496  if (type == HOST_DECL)
2497  {
2498  char *hostdn, *basedn, *temp1, *temp2, filter[1024];
2499  LDAPMessage *groupdn, *entry;
2500  int ret;
2501 
2502  hostdn = ldap_get_dn (ld, ent);
2503  if( hostdn != NULL)
2504  {
2505  basedn = NULL;
2506 
2507  temp1 = strchr (hostdn, '=');
2508  if (temp1 != NULL)
2509  temp1 = strchr (++temp1, '=');
2510  if (temp1 != NULL)
2511  temp2 = strchr (++temp1, ',');
2512  else
2513  temp2 = NULL;
2514 
2515  if (temp2 != NULL)
2516  {
2517  struct berval bv_o;
2518 
2519  if (_do_ldap_str2esc_filter_bv(temp1, (temp2 - temp1), &bv_o) == NULL)
2520  {
2521  log_error ("Cannot escape ldap filter value %.*s: %m",
2522  (int)(temp2 - temp1), temp1);
2523  filter[0] = '\0';
2524  }
2525  else
2526  {
2527  snprintf (filter, sizeof(filter),
2528  "(&(cn=%s)(objectClass=dhcpGroup))",
2529  bv_o.bv_val);
2530 
2531  ber_memfree(bv_o.bv_val);
2532  }
2533 
2534  basedn = strchr (temp1, ',');
2535  if (basedn != NULL)
2536  ++basedn;
2537  }
2538 
2539  if (basedn != NULL && *basedn != '\0' && filter[0] != '\0')
2540  {
2541  ret = ldap_search_ext_s (ld, basedn, LDAP_SCOPE_SUBTREE, filter,
2542  NULL, 0, NULL, NULL, NULL, 0, &groupdn);
2543  if (ret == LDAP_SUCCESS)
2544  {
2545  if ((entry = ldap_first_entry (ld, groupdn)) != NULL)
2546  {
2547  res = ldap_parse_entry_options (entry, cfile, &lease_limit);
2548  if (res != ISC_R_SUCCESS)
2549  {
2550  /* reset option buffer discarding any results */
2551  x_parser_reset(cfile);
2552  lease_limit = 0;
2553  }
2554  }
2555  ldap_msgfree( groupdn);
2556  }
2557  }
2558  ldap_memfree( hostdn);
2559  }
2560  }
2561 
2562  res = ldap_parse_entry_options (ent, cfile, &lease_limit);
2563  if (res != ISC_R_SUCCESS)
2564  {
2565  x_parser_free(&cfile);
2566  return (lease_limit);
2567  }
2568 
2569  if (x_parser_length(cfile) == 0)
2570  {
2571  x_parser_free(&cfile);
2572  return (lease_limit);
2573  }
2574 
2575  declaration = 0;
2576  do
2577  {
2578  token = peek_token (&val, NULL, cfile);
2579  if (token == END_OF_FILE)
2580  break;
2581  declaration = parse_statement (cfile, group, type, host, declaration);
2582  } while (1);
2583 
2584  x_parser_free(&cfile);
2585 
2586  return (lease_limit);
2587 }
2588 
2589 
2590 
2591 int
2592 find_haddr_in_ldap (struct host_decl **hp, int htype, unsigned hlen,
2593  const unsigned char *haddr, const char *file, int line)
2594 {
2595  char buf[128], *type_str;
2596  LDAPMessage * res, *ent;
2597  struct host_decl * host;
2598  isc_result_t status;
2599  ldap_dn_node *curr;
2600  char up_hwaddr[20];
2601  char lo_hwaddr[20];
2602  int ret;
2603  struct berval bv_o[2];
2604 
2605  *hp = NULL;
2606 
2607 
2608  if (ldap_method == LDAP_METHOD_STATIC)
2609  return (0);
2610 
2611  if (ld == NULL)
2612  ldap_start ();
2613  if (ld == NULL)
2614  return (0);
2615 
2616  switch (htype)
2617  {
2618  case HTYPE_ETHER:
2619  type_str = "ethernet";
2620  break;
2621  case HTYPE_IEEE802:
2622  type_str = "token-ring";
2623  break;
2624  case HTYPE_FDDI:
2625  type_str = "fddi";
2626  break;
2627  default:
2628  log_info ("Ignoring unknown type %d", htype);
2629  return (0);
2630  }
2631 
2632  /*
2633  ** FIXME: It is not guaranteed, that the dhcpHWAddress attribute
2634  ** contains _exactly_ "type addr" with one space between!
2635  */
2636  snprintf(lo_hwaddr, sizeof(lo_hwaddr), "%s",
2637  print_hw_addr (htype, hlen, haddr));
2638  x_strxform(up_hwaddr, lo_hwaddr, sizeof(up_hwaddr), toupper);
2639 
2640  if (_do_ldap_str2esc_filter_bv(lo_hwaddr, 0, &bv_o[0]) == NULL)
2641  {
2642  log_error ("Cannot escape ldap filter value %s: %m", lo_hwaddr);
2643  return (0);
2644  }
2645  if (_do_ldap_str2esc_filter_bv(up_hwaddr, 0, &bv_o[1]) == NULL)
2646  {
2647  log_error ("Cannot escape ldap filter value %s: %m", up_hwaddr);
2648  ber_memfree(bv_o[0].bv_val);
2649  return (0);
2650  }
2651 
2652  snprintf (buf, sizeof (buf),
2653  "(&(objectClass=dhcpHost)(|(dhcpHWAddress=%s %s)(dhcpHWAddress=%s %s)))",
2654  type_str, bv_o[0].bv_val, type_str, bv_o[1].bv_val);
2655 
2656  ber_memfree(bv_o[0].bv_val);
2657  ber_memfree(bv_o[1].bv_val);
2658 
2659  res = ent = NULL;
2660  for (curr = ldap_service_dn_head;
2661  curr != NULL && *curr->dn != '\0';
2662  curr = curr->next)
2663  {
2664 #if defined (DEBUG_LDAP)
2665  log_info ("Searching for %s in LDAP tree %s", buf, curr->dn);
2666 #endif
2667  ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf, NULL, 0,
2668  NULL, NULL, NULL, 0, &res);
2669 
2670  if(ret == LDAP_SERVER_DOWN)
2671  {
2672  log_info ("LDAP server was down, trying to reconnect...");
2673 
2674  ldap_stop();
2675  ldap_start();
2676  if(ld == NULL)
2677  {
2678  log_info ("LDAP reconnect failed - try again later...");
2679  return (0);
2680  }
2681 
2682  ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf, NULL,
2683  0, NULL, NULL, NULL, 0, &res);
2684  }
2685 
2686  if (ret == LDAP_SUCCESS)
2687  {
2688  ent = ldap_first_entry (ld, res);
2689 #if defined (DEBUG_LDAP)
2690  if (ent == NULL) {
2691  log_info ("No host entry for %s in LDAP tree %s",
2692  buf, curr->dn);
2693  }
2694 #endif
2695  while (ent != NULL) {
2696 #if defined (DEBUG_LDAP)
2697  char *dn = ldap_get_dn (ld, ent);
2698  if (dn != NULL)
2699  {
2700  log_info ("Found dhcpHWAddress LDAP entry %s", dn);
2701  ldap_memfree(dn);
2702  }
2703 #endif
2704 
2705  host = (struct host_decl *)0;
2706  status = host_allocate (&host, MDL);
2707  if (status != ISC_R_SUCCESS)
2708  {
2709  log_fatal ("can't allocate host decl struct: %s",
2710  isc_result_totext (status));
2711  ldap_msgfree (res);
2712  return (0);
2713  }
2714 
2715  host->name = ldap_get_host_name (ent);
2716  if (host->name == NULL)
2717  {
2718  host_dereference (&host, MDL);
2719  ldap_msgfree (res);
2720  return (0);
2721  }
2722 
2723  if (!clone_group (&host->group, root_group, MDL))
2724  {
2725  log_fatal ("can't clone group for host %s", host->name);
2726  host_dereference (&host, MDL);
2727  ldap_msgfree (res);
2728  return (0);
2729  }
2730 
2731  ldap_parse_options (ent, host->group, HOST_DECL, host, NULL);
2732 
2733  host->n_ipaddr = *hp;
2734  *hp = host;
2735  ent = ldap_next_entry (ld, ent);
2736  }
2737  if(res)
2738  {
2739  ldap_msgfree (res);
2740  res = NULL;
2741  }
2742  return (*hp != NULL);
2743  }
2744  else
2745  {
2746  if(res)
2747  {
2748  ldap_msgfree (res);
2749  res = NULL;
2750  }
2751 
2752  if (ret != LDAP_NO_SUCH_OBJECT && ret != LDAP_SUCCESS)
2753  {
2754  log_error ("Cannot search for %s in LDAP tree %s: %s", buf,
2755  curr->dn, ldap_err2string (ret));
2756  ldap_stop();
2757  return (0);
2758  }
2759 #if defined (DEBUG_LDAP)
2760  else
2761  {
2762  log_info ("ldap_search_ext_s returned %s when searching for %s in %s",
2763  ldap_err2string (ret), buf, curr->dn);
2764  }
2765 #endif
2766  }
2767  }
2768 
2769  return (0);
2770 }
2771 
2772 
2773 int
2774 find_subclass_in_ldap (struct class *class, struct class **newclass,
2775  struct data_string *data)
2776 {
2777  LDAPMessage * res, * ent;
2778  int ret, lease_limit;
2779  isc_result_t status;
2780  ldap_dn_node *curr;
2781  char buf[2048];
2782  struct berval bv_class;
2783  struct berval bv_cdata;
2784  char *hex_1;
2785 
2786  if (ldap_method == LDAP_METHOD_STATIC)
2787  return (0);
2788 
2789  if (ld == NULL)
2790  ldap_start ();
2791  if (ld == NULL)
2792  return (0);
2793 
2794  hex_1 = print_hex_1 (data->len, data->data, 1024);
2795  if (*hex_1 == '"')
2796  {
2797  /* result is a quotted not hex string: ldap escape the original string */
2798  if (_do_ldap_str2esc_filter_bv((const char*)data->data, data->len, &bv_cdata) == NULL)
2799  {
2800  log_error ("Cannot escape ldap filter value %s: %m", hex_1);
2801  return (0);
2802  }
2803  hex_1 = NULL;
2804  }
2805  if (_do_ldap_str2esc_filter_bv(class->name, strlen (class->name), &bv_class) == NULL)
2806  {
2807  log_error ("Cannot escape ldap filter value %s: %m", class->name);
2808  if (hex_1 == NULL)
2809  ber_memfree(bv_cdata.bv_val);
2810  return (0);
2811  }
2812 
2813  snprintf (buf, sizeof (buf),
2814  "(&(objectClass=dhcpSubClass)(cn=%s)(dhcpClassData=%s))",
2815  (hex_1 == NULL ? bv_cdata.bv_val : hex_1), bv_class.bv_val);
2816 
2817  if (hex_1 == NULL)
2818  ber_memfree(bv_cdata.bv_val);
2819  ber_memfree(bv_class.bv_val);
2820 
2821 #if defined (DEBUG_LDAP)
2822  log_info ("Searching LDAP for %s", buf);
2823 #endif
2824 
2825  res = ent = NULL;
2826  for (curr = ldap_service_dn_head;
2827  curr != NULL && *curr->dn != '\0';
2828  curr = curr->next)
2829  {
2830 #if defined (DEBUG_LDAP)
2831  log_info ("Searching for %s in LDAP tree %s", buf, curr->dn);
2832 #endif
2833  ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf, NULL, 0,
2834  NULL, NULL, NULL, 0, &res);
2835 
2836  if(ret == LDAP_SERVER_DOWN)
2837  {
2838  log_info ("LDAP server was down, trying to reconnect...");
2839 
2840  ldap_stop();
2841  ldap_start();
2842 
2843  if(ld == NULL)
2844  {
2845  log_info ("LDAP reconnect failed - try again later...");
2846  return (0);
2847  }
2848 
2849  ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf,
2850  NULL, 0, NULL, NULL, NULL, 0, &res);
2851  }
2852 
2853  if (ret == LDAP_SUCCESS)
2854  {
2855  if( (ent = ldap_first_entry (ld, res)) != NULL)
2856  break; /* search OK and have entry */
2857 
2858 #if defined (DEBUG_LDAP)
2859  log_info ("No subclass entry for %s in LDAP tree %s",
2860  buf, curr->dn);
2861 #endif
2862  if(res)
2863  {
2864  ldap_msgfree (res);
2865  res = NULL;
2866  }
2867  }
2868  else
2869  {
2870  if(res)
2871  {
2872  ldap_msgfree (res);
2873  res = NULL;
2874  }
2875 
2876  if (ret != LDAP_NO_SUCH_OBJECT && ret != LDAP_SUCCESS)
2877  {
2878  log_error ("Cannot search for %s in LDAP tree %s: %s", buf,
2879  curr->dn, ldap_err2string (ret));
2880  ldap_stop();
2881  return (0);
2882  }
2883 #if defined (DEBUG_LDAP)
2884  else
2885  {
2886  log_info ("ldap_search_ext_s returned %s when searching for %s in %s",
2887  ldap_err2string (ret), buf, curr->dn);
2888  }
2889 #endif
2890  }
2891  }
2892 
2893  if (res && ent)
2894  {
2895 #if defined (DEBUG_LDAP)
2896  char *dn = ldap_get_dn (ld, ent);
2897  if (dn != NULL)
2898  {
2899  log_info ("Found subclass LDAP entry %s", dn);
2900  ldap_memfree(dn);
2901  }
2902 #endif
2903 
2904  status = class_allocate (newclass, MDL);
2905  if (status != ISC_R_SUCCESS)
2906  {
2907  log_error ("Cannot allocate memory for a new class");
2908  ldap_msgfree (res);
2909  return (0);
2910  }
2911 
2912  group_reference (&(*newclass)->group, class->group, MDL);
2913  class_reference (&(*newclass)->superclass, class, MDL);
2914  lease_limit = ldap_parse_options (ent, (*newclass)->group,
2915  CLASS_DECL, NULL, newclass);
2916  if (lease_limit == 0)
2917  (*newclass)->lease_limit = class->lease_limit;
2918  else
2919  class->lease_limit = lease_limit;
2920 
2921  if ((*newclass)->lease_limit)
2922  {
2923  (*newclass)->billed_leases =
2924  dmalloc ((*newclass)->lease_limit * sizeof (struct lease *), MDL);
2925  if (!(*newclass)->billed_leases)
2926  {
2927  log_error ("no memory for billing");
2928  class_dereference (newclass, MDL);
2929  ldap_msgfree (res);
2930  return (0);
2931  }
2932  memset ((*newclass)->billed_leases, 0,
2933  ((*newclass)->lease_limit * sizeof (struct lease *)));
2934  }
2935 
2936  data_string_copy (&(*newclass)->hash_string, data, MDL);
2937 
2938  ldap_msgfree (res);
2939  return (1);
2940  }
2941 
2942  if(res) ldap_msgfree (res);
2943  return (0);
2944 }
2945 
2946 int find_client_in_ldap (struct host_decl **hp, struct packet *packet,
2947  struct option_state *state, const char *file, int line)
2948 {
2949  LDAPMessage * res, * ent;
2950  ldap_dn_node *curr;
2951  struct host_decl * host;
2952  isc_result_t status;
2953  struct data_string client_id;
2954  char buf[1024], buf1[1024];
2955  int ret;
2956 
2957  if (ldap_method == LDAP_METHOD_STATIC)
2958  return (0);
2959 
2960  if (ld == NULL)
2961  ldap_start ();
2962  if (ld == NULL)
2963  return (0);
2964 
2965  memset(&client_id, 0, sizeof(client_id));
2966  if (get_client_id(packet, &client_id) != ISC_R_SUCCESS)
2967  return (0);
2968  snprintf(buf, sizeof(buf),
2969  "(&(objectClass=dhcpHost)(dhcpClientId=%s))",
2970  print_hw_addr(0, client_id.len, client_id.data));
2971 
2972  /* log_info ("Searching LDAP for %s (%s)", buf, packet->interface->shared_network->name); */
2973 
2974  res = ent = NULL;
2975  for (curr = ldap_service_dn_head;
2976  curr != NULL && *curr->dn != '\0';
2977  curr = curr->next)
2978  {
2979  snprintf(buf1, sizeof(buf1), "cn=%s,%s", packet->interface->shared_network->name, curr->dn);
2980 #if defined (DEBUG_LDAP)
2981  log_info ("Searching for %s in LDAP tree %s", buf, buf1);
2982 #endif
2983  ret = ldap_search_ext_s (ld, buf1, LDAP_SCOPE_SUBTREE, buf, NULL, 0,
2984  NULL, NULL, NULL, 0, &res);
2985 
2986  if(ret == LDAP_SERVER_DOWN)
2987  {
2988  log_info ("LDAP server was down, trying to reconnect...");
2989 
2990  ldap_stop();
2991  ldap_start();
2992 
2993  if(ld == NULL)
2994  {
2995  log_info ("LDAP reconnect failed - try again later...");
2996  return (0);
2997  }
2998 
2999  ret = ldap_search_ext_s (ld, buf1, LDAP_SCOPE_SUBTREE, buf,
3000  NULL, 0, NULL, NULL, NULL, 0, &res);
3001  }
3002 
3003  if (ret == LDAP_SUCCESS)
3004  {
3005  if( (ent = ldap_first_entry (ld, res)) != NULL) {
3006  log_info ("found entry in search %s", buf1);
3007  break; /* search OK and have entry */
3008  }
3009 
3010 #if defined (DEBUG_LDAP)
3011  log_info ("No subclass entry for %s in LDAP tree %s", buf, curr->dn);
3012 #endif
3013  if(res)
3014  {
3015  ldap_msgfree (res);
3016  res = NULL;
3017  }
3018  }
3019  else
3020  {
3021  if(res)
3022  {
3023  ldap_msgfree (res);
3024  res = NULL;
3025  }
3026 
3027  if (ret != LDAP_NO_SUCH_OBJECT && ret != LDAP_SUCCESS)
3028  {
3029  log_error ("Cannot search for %s in LDAP tree %s: %s", buf,
3030  curr->dn, ldap_err2string (ret));
3031  ldap_stop();
3032  return (0);
3033  }
3034  else
3035  {
3036  log_info ("did not find: %s", buf);
3037  }
3038  }
3039  }
3040 
3041  if (res && ent)
3042  {
3043 #if defined (DEBUG_LDAP)
3044  log_info ("ldap_get_dn %s", curr->dn);
3045  char *dn = ldap_get_dn (ld, ent);
3046  if (dn != NULL)
3047  {
3048  log_info ("Found subclass LDAP entry %s", dn);
3049  ldap_memfree(dn);
3050  } else {
3051  log_info ("DN is null %s", dn);
3052  }
3053 #endif
3054 
3055  host = (struct host_decl *)0;
3056  status = host_allocate (&host, MDL);
3057  if (status != ISC_R_SUCCESS)
3058  {
3059  log_fatal ("can't allocate host decl struct: %s",
3060  isc_result_totext (status));
3061  ldap_msgfree (res);
3062  return (0);
3063  }
3064 
3065  host->name = ldap_get_host_name (ent);
3066  if (host->name == NULL)
3067  {
3068  host_dereference (&host, MDL);
3069  ldap_msgfree (res);
3070  return (0);
3071  }
3072  /* log_info ("Host name %s", host->name); */
3073 
3074  if (!clone_group (&host->group, root_group, MDL))
3075  {
3076  log_fatal ("can't clone group for host %s", host->name);
3077  host_dereference (&host, MDL);
3078  ldap_msgfree (res);
3079  return (0);
3080  }
3081 
3082  ldap_parse_options (ent, host->group, HOST_DECL, host, NULL);
3083 
3084  *hp = host;
3085  ldap_msgfree (res);
3086  return (1);
3087  }
3088  else
3089  {
3090  log_info ("did not find clientid: %s", buf);
3091  }
3092 
3093  if(res) ldap_msgfree (res);
3094  return (0);
3095 
3096 }
3097 
3098 #if defined(LDAP_USE_GSSAPI)
3099 static int
3100 _ldap_sasl_interact(LDAP *ld, unsigned flags, void *defaults, void *sin)
3101 {
3102  sasl_interact_t *in;
3103  struct ldap_sasl_instance *ldap_inst = defaults;
3104  int ret = LDAP_OTHER;
3105  size_t size;
3106 
3107  if (ld == NULL || sin == NULL)
3108  return LDAP_PARAM_ERROR;
3109 
3110  log_info("doing interactive bind");
3111  for (in = sin; in != NULL && in->id != SASL_CB_LIST_END; in++) {
3112  switch (in->id) {
3113  case SASL_CB_USER:
3114  log_info("got request for SASL_CB_USER %s", ldap_inst->sasl_authz_id);
3115  size = strlen(ldap_inst->sasl_authz_id);
3116  in->result = ldap_inst->sasl_authz_id;
3117  in->len = size;
3118  ret = LDAP_SUCCESS;
3119  break;
3120  case SASL_CB_GETREALM:
3121  log_info("got request for SASL_CB_GETREALM %s", ldap_inst->sasl_realm);
3122  size = strlen(ldap_inst->sasl_realm);
3123  in->result = ldap_inst->sasl_realm;
3124  in->len = size;
3125  ret = LDAP_SUCCESS;
3126  break;
3127  case SASL_CB_AUTHNAME:
3128  log_info("got request for SASL_CB_AUTHNAME %s", ldap_inst->sasl_authc_id);
3129  size = strlen(ldap_inst->sasl_authc_id);
3130  in->result = ldap_inst->sasl_authc_id;
3131  in->len = size;
3132  ret = LDAP_SUCCESS;
3133  break;
3134  case SASL_CB_PASS:
3135  log_info("got request for SASL_CB_PASS %s", ldap_inst->sasl_password);
3136  size = strlen(ldap_inst->sasl_password);
3137  in->result = ldap_inst->sasl_password;
3138  in->len = size;
3139  ret = LDAP_SUCCESS;
3140  break;
3141  default:
3142  goto cleanup;
3143  }
3144  }
3145  return ret;
3146 
3147 cleanup:
3148  in->result = NULL;
3149  in->len = 0;
3150  return LDAP_OTHER;
3151 }
3152 #endif /* LDAP_USE_GSSAPI */
3153 
3154 
3155 #endif
const char int line
Definition: dhcpd.h:3717
struct binding_scope * global_scope
Definition: tree.c:38
Definition: dhcpd.h:556
unsigned len
Definition: tree.h:80
struct shared_network * shared_network
Definition: dhcpd.h:1346
isc_result_t end_parse(struct parse **cfile)
Definition: conflex.c:103
void * dmalloc(unsigned, const char *, int)
Definition: alloc.c:56
struct universe server_universe
Definition: stables.c:175
size_t buflen
Definition: dhcpd.h:329
#define MDL
Definition: omapip.h:568
#define print_hex_1(len, data, limit)
Definition: dhcpd.h:2568
int group_reference(struct group **ptr, struct group *bp, const char *file, int line)
Definition: alloc.c:177
void data_string_forget(struct data_string *data, const char *file, int line)
Definition: alloc.c:1339
struct group * root_group
Definition: memory.c:31
int log_error(const char *,...) __attribute__((__format__(__printf__
const char * tlname
Definition: dhcpd.h:294
enum dhcp_token peek_token(const char **rval, unsigned *rlen, struct parse *cfile)
Definition: conflex.c:443
struct parse * saved_state
Definition: dhcpd.h:332
#define HAVE_INET_NTOP
Definition: config.h:63
Definition: dhcpd.h:288
char * name
Definition: dhcpd.h:1070
void log_fatal(const char *,...) __attribute__((__format__(__printf__
#define HTYPE_ETHER
Definition: dhcp.h:76
void execute_statements_in_scope(struct binding_value **result, struct packet *packet, struct lease *lease, struct client_state *client_state, struct option_state *in_options, struct option_state *out_options, struct binding_scope **scope, struct group *group, struct group *limiting_group, struct on_star *on_star)
Definition: execute.c:562
int option_state_allocate(struct option_state **ptr, const char *file, int line)
Definition: alloc.c:846
int evaluate_option_cache(struct data_string *result, struct packet *packet, struct lease *lease, struct client_state *client_state, struct option_state *in_options, struct option_state *cfg_options, struct binding_scope **scope, struct option_cache *oc, const char *file, int line)
Definition: tree.c:2699
struct interface_info * interface
Definition: dhcpd.h:433
Definition: dhcpd.h:405
char * name
Definition: dhcpd.h:942
void dfree(void *, const char *, int)
Definition: alloc.c:131
struct host_decl * n_ipaddr
Definition: dhcpd.h:940
struct option_cache * lookup_option(struct universe *universe, struct option_state *options, unsigned code)
Definition: options.c:2348
int int log_info(const char *,...) __attribute__((__format__(__printf__
#define CLASS_DECL
Definition: dhcpd.h:686
void cleanup(void)
dhcp_token
Definition: dhctoken.h:34
isc_result_t get_client_id(struct packet *, struct data_string *)
#define ROOT_GROUP
Definition: dhcpd.h:682
#define HTYPE_FDDI
Definition: dhcp.h:78
int parse_statement(struct parse *, struct group *, int, struct host_decl *, int)
Definition: confpars.c:356
int option_state_dereference(struct option_state **ptr, const char *file, int line)
Definition: alloc.c:911
Definition: dhcpd.h:926
size_t bufsiz
Definition: dhcpd.h:330
const char int
Definition: omapip.h:443
size_t bufix
Definition: dhcpd.h:329
#define HOST_DECL
Definition: dhcpd.h:683
#define HTYPE_IEEE802
Definition: dhcp.h:77
int flags
Definition: dhcpd.h:955
const char * file
Definition: dhcpd.h:3717
char * name
Definition: dhcpd.h:1024
char * inbuf
Definition: dhcpd.h:328
Definition: dhcpd.h:1066
const unsigned char * data
Definition: tree.h:79
isc_result_t conf_file_subparse(struct parse *, struct group *, int)
Definition: confpars.c:242
void data_string_copy(struct data_string *dest, const struct data_string *src, const char *file, int line)
Definition: alloc.c:1323
int clone_group(struct group **gp, struct group *group, const char *file, int line)
Definition: memory.c:130
isc_result_t new_parse(struct parse **cfile, int file, char *inbuf, unsigned buflen, const char *name, int eolp)
Definition: conflex.c:41
struct group * group
Definition: dhcpd.h:952
struct group * group
Definition: dhcpd.h:1093